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Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/crossOriginIsolated"><code>crossOriginIsolated</code></a></li><li><a href="/ja/docs/Web/API/Window/crypto"><code>crypto</code></a></li><li><a href="/ja/docs/Web/API/Window/customElements"><code>customElements</code></a></li><li><a href="/ja/docs/Web/API/Window/devicePixelRatio"><code>devicePixelRatio</code></a></li><li><a href="/ja/docs/Web/API/Window/document"><code>document</code></a></li><li><a href="/ja/docs/Web/API/Window/documentPictureInPicture"><code>documentPictureInPicture</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/event"><code>event</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/external"><code>external</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/en-US/docs/Web/API/Window/fence" class="only-in-en-us"><code>fence</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/frameElement"><code>frameElement</code></a></li><li><a href="/ja/docs/Web/API/Window/frames"><code>frames</code></a></li><li><a href="/ja/docs/Web/API/Window/fullScreen"><code>fullScreen</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/history"><code>history</code></a></li><li><a href="/ja/docs/Web/API/Window/indexedDB"><code>indexedDB</code></a></li><li><a href="/ja/docs/Web/API/Window/innerHeight"><code>innerHeight</code></a></li><li><a href="/ja/docs/Web/API/Window/innerWidth"><code>innerWidth</code></a></li><li><a href="/ja/docs/Web/API/Window/isSecureContext"><code>isSecureContext</code></a></li><li><a href="/en-US/docs/Web/API/Window/launchQueue" class="only-in-en-us"><code>launchQueue</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/length"><code>length</code></a></li><li><a href="/ja/docs/Web/API/Window/localStorage"><code>localStorage</code></a></li><li><a href="/ja/docs/Web/API/Window/location"><code>location</code></a></li><li><a href="/ja/docs/Web/API/Window/locationbar"><code>locationbar</code></a></li><li><a href="/ja/docs/Web/API/Window/menubar"><code>menubar</code></a></li><li><a href="/ja/docs/Web/API/Window/mozInnerScreenX"><code>mozInnerScreenX</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/mozInnerScreenY"><code>mozInnerScreenY</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/name"><code>name</code></a></li><li><a href="/en-US/docs/Web/API/Window/navigation" class="only-in-en-us"><code>navigation</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/navigator"><code>navigator</code></a></li><li><a href="/ja/docs/Web/API/Window/opener"><code>opener</code></a></li><li><a href="/en-US/docs/Web/API/Window/orientation" class="only-in-en-us"><code>orientation</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/origin"><code>origin</code></a></li><li><a href="/en-US/docs/Web/API/Window/originAgentCluster" class="only-in-en-us"><code>originAgentCluster</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/outerHeight"><code>outerHeight</code></a></li><li><a href="/ja/docs/Web/API/Window/outerWidth"><code>outerWidth</code></a></li><li><a href="/ja/docs/Web/API/Window/parent"><code>parent</code></a></li><li><a href="/ja/docs/Web/API/Window/performance"><code>performance</code></a></li><li><a href="/ja/docs/Web/API/Window/personalbar"><code>personalbar</code></a></li><li><a href="/en-US/docs/Web/API/Window/scheduler" class="only-in-en-us"><code>scheduler</code></a></li><li><a href="/ja/docs/Web/API/Window/screen"><code>screen</code></a></li><li><a href="/en-US/docs/Web/API/Window/screenLeft" class="only-in-en-us"><code>screenLeft</code></a></li><li><a href="/en-US/docs/Web/API/Window/screenTop" class="only-in-en-us"><code>screenTop</code></a></li><li><a href="/ja/docs/Web/API/Window/screenX"><code>screenX</code></a></li><li><a href="/ja/docs/Web/API/Window/screenY"><code>screenY</code></a></li><li><a href="/ja/docs/Web/API/Window/scrollbars"><code>scrollbars</code></a></li><li><a href="/ja/docs/Web/API/Window/scrollMaxX"><code>scrollMaxX</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/scrollMaxY"><code>scrollMaxY</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/scrollX"><code>scrollX</code></a></li><li><a href="/ja/docs/Web/API/Window/scrollY"><code>scrollY</code></a></li><li><a href="/ja/docs/Web/API/Window/self"><code>self</code></a></li><li><a href="/ja/docs/Web/API/Window/sessionStorage"><code>sessionStorage</code></a></li><li><a href="/en-US/docs/Web/API/Window/sharedStorage" class="only-in-en-us"><code>sharedStorage</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/speechSynthesis"><code>speechSynthesis</code></a></li><li><a href="/ja/docs/Web/API/Window/status"><code>status</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/statusbar"><code>statusbar</code></a></li><li><a href="/ja/docs/Web/API/Window/toolbar"><code>toolbar</code></a></li><li><a href="/ja/docs/Web/API/Window/top"><code>top</code></a></li><li><a href="/en-US/docs/Web/API/Window/trustedTypes" class="only-in-en-us"><code>trustedTypes</code></a></li><li><a href="/ja/docs/Web/API/Window/visualViewport"><code>visualViewport</code></a></li><li><a href="/ja/docs/Web/API/Window/window"><code>window</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>インスタンスメソッド</summary><ol><li><a href="/ja/docs/Web/API/Window/alert"><code>alert()</code></a></li><li><a href="/ja/docs/Web/API/Window/atob"><code>atob()</code></a></li><li><a href="/ja/docs/Web/API/Window/back"><code>back()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/blur"><code>blur()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/btoa"><code>btoa()</code></a></li><li><a href="/ja/docs/Web/API/Window/cancelAnimationFrame"><code>cancelAnimationFrame()</code></a></li><li><a href="/en-US/docs/Web/API/Window/cancelIdleCallback" class="only-in-en-us"><code>cancelIdleCallback()</code></a></li><li><a href="/ja/docs/Web/API/Window/captureEvents"><code>captureEvents()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/en-US/docs/Web/API/Window/clearImmediate" class="only-in-en-us"><code>clearImmediate()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/clearInterval"><code>clearInterval()</code></a></li><li><a href="/ja/docs/Web/API/Window/clearTimeout"><code>clearTimeout()</code></a></li><li><a href="/ja/docs/Web/API/Window/close"><code>close()</code></a></li><li><a href="/ja/docs/Web/API/Window/confirm"><code>confirm()</code></a></li><li><a href="/ja/docs/Web/API/Window/createImageBitmap"><code>createImageBitmap()</code></a></li><li><a href="/ja/docs/Web/API/Window/dump"><code>dump()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/fetch"><code>fetch()</code></a></li><li><a href="/ja/docs/Web/API/Window/find"><code>find()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/focus"><code>focus()</code></a></li><li><a href="/ja/docs/Web/API/Window/forward"><code>forward()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/getComputedStyle"><code>getComputedStyle()</code></a></li><li><a href="/en-US/docs/Web/API/Window/getDefaultComputedStyle" class="only-in-en-us"><code>getDefaultComputedStyle()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/getScreenDetails"><code>getScreenDetails()</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/getSelection"><code>getSelection()</code></a></li><li><a href="/ja/docs/Web/API/Window/matchMedia"><code>matchMedia()</code></a></li><li><a href="/ja/docs/Web/API/Window/moveBy"><code>moveBy()</code></a></li><li><a href="/ja/docs/Web/API/Window/moveTo"><code>moveTo()</code></a></li><li><a href="/ja/docs/Web/API/Window/open"><code>open()</code></a></li><li><a href="/ja/docs/Web/API/Window/postMessage"><code>postMessage()</code></a></li><li><a href="/ja/docs/Web/API/Window/print"><code>print()</code></a></li><li><a href="/ja/docs/Web/API/Window/prompt"><code>prompt()</code></a></li><li><a href="/en-US/docs/Web/API/Window/queryLocalFonts" class="only-in-en-us"><code>queryLocalFonts()</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/queueMicrotask"><code>queueMicrotask()</code></a></li><li><a href="/ja/docs/Web/API/Window/releaseEvents"><code>releaseEvents()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/reportError"><code>reportError()</code></a></li><li><a href="/ja/docs/Web/API/Window/requestAnimationFrame"><code>requestAnimationFrame()</code></a></li><li><a href="/en-US/docs/Web/API/Window/requestFileSystem" class="only-in-en-us"><code>requestFileSystem()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/requestIdleCallback"><code>requestIdleCallback()</code></a></li><li><a href="/ja/docs/Web/API/Window/resizeBy"><code>resizeBy()</code></a></li><li><a href="/ja/docs/Web/API/Window/resizeTo"><code>resizeTo()</code></a></li><li><a href="/ja/docs/Web/API/Window/scroll"><code>scroll()</code></a></li><li><a href="/ja/docs/Web/API/Window/scrollBy"><code>scrollBy()</code></a></li><li><a href="/ja/docs/Web/API/Window/scrollByLines"><code>scrollByLines()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/scrollByPages"><code>scrollByPages()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/scrollTo"><code>scrollTo()</code></a></li><li><a href="/en-US/docs/Web/API/Window/setImmediate" class="only-in-en-us"><code>setImmediate()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/setInterval"><code>setInterval()</code></a></li><li><a href="/en-US/docs/Web/API/Window/setResizable" class="only-in-en-us"><code>setResizable()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/setTimeout"><code>setTimeout()</code></a></li><li><a href="/ja/docs/Web/API/Window/showDirectoryPicker"><code>showDirectoryPicker()</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/showModalDialog"><code>showModalDialog()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/showOpenFilePicker"><code>showOpenFilePicker()</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/showSaveFilePicker"><code>showSaveFilePicker()</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/sizeToContent"><code>sizeToContent()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/stop"><code>stop()</code></a></li><li><a href="/ja/docs/Web/API/Window/structuredClone"><code>structuredClone()</code></a></li><li><a href="/en-US/docs/Web/API/Window/webkitConvertPointFromNodeToPage" class="only-in-en-us"><code>webkitConvertPointFromNodeToPage()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/en-US/docs/Web/API/Window/webkitConvertPointFromPageToNode" class="only-in-en-us"><code>webkitConvertPointFromPageToNode()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li></ol></details></li><li class="toggle"><details open=""><summary>イベント</summary><ol><li><a href="/ja/docs/Web/API/Window/afterprint_event"><code>afterprint</code></a></li><li><a href="/ja/docs/Web/API/Window/appinstalled_event"><code>appinstalled</code></a></li><li><a href="/en-US/docs/Web/API/Window/beforeinstallprompt_event" class="only-in-en-us"><code>beforeinstallprompt</code></a></li><li><a href="/ja/docs/Web/API/Window/beforeprint_event"><code>beforeprint</code></a></li><li><a href="/ja/docs/Web/API/Window/beforeunload_event"><code>beforeunload</code></a></li><li><a href="/ja/docs/Web/API/Window/blur_event"><code>blur</code></a></li><li><a href="/ja/docs/Web/API/Window/copy_event"><code>copy</code></a></li><li><a href="/ja/docs/Web/API/Window/cut_event"><code>cut</code></a></li><li><a href="/ja/docs/Web/API/Window/devicemotion_event"><code>devicemotion</code></a></li><li><a href="/ja/docs/Web/API/Window/deviceorientation_event"><code>deviceorientation</code></a></li><li><a href="/ja/docs/Web/API/Window/deviceorientationabsolute_event"><code>deviceorientationabsolute</code></a></li><li><a href="/ja/docs/Web/API/Window/error_event"><code>error</code></a></li><li><a href="/ja/docs/Web/API/Window/focus_event"><code>focus</code></a></li><li><a href="/ja/docs/Web/API/Window/gamepadconnected_event"><code>gamepadconnected</code></a></li><li><a href="/ja/docs/Web/API/Window/gamepaddisconnected_event"><code>gamepaddisconnected</code></a></li><li><a href="/ja/docs/Web/API/Window/hashchange_event"><code>hashchange</code></a></li><li><a href="/ja/docs/Web/API/Window/languagechange_event"><code>languagechange</code></a></li><li><a href="/ja/docs/Web/API/Window/load_event"><code>load</code></a></li><li><a href="/ja/docs/Web/API/Window/message_event"><code>message</code></a></li><li><a href="/ja/docs/Web/API/Window/messageerror_event"><code>messageerror</code></a></li><li><a href="/ja/docs/Web/API/Window/offline_event"><code>offline</code></a></li><li><a href="/ja/docs/Web/API/Window/online_event"><code>online</code></a></li><li><a href="/ja/docs/Web/API/Window/orientationchange_event"><code>orientationchange</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/pagehide_event"><code>pagehide</code></a></li><li><a href="/ja/docs/Web/API/Window/pagereveal_event"><code>pagereveal</code></a></li><li><a href="/ja/docs/Web/API/Window/pageshow_event"><code>pageshow</code></a></li><li><a href="/ja/docs/Web/API/Window/pageswap_event"><code>pageswap</code></a></li><li><a href="/ja/docs/Web/API/Window/paste_event"><code>paste</code></a></li><li><a href="/ja/docs/Web/API/Window/popstate_event"><code>popstate</code></a></li><li><a href="/ja/docs/Web/API/Window/rejectionhandled_event"><code>rejectionhandled</code></a></li><li><a href="/ja/docs/Web/API/Window/resize_event"><code>resize</code></a></li><li><a href="/en-US/docs/Web/API/Window/scrollsnapchange_event" class="only-in-en-us"><code>scrollsnapchange</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/API/Window/scrollsnapchanging_event" class="only-in-en-us"><code>scrollsnapchanging</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/storage_event"><code>storage</code></a></li><li><em><a href="/ja/docs/Web/API/Window/unhandledrejection_event" aria-current="page"><code>unhandledrejection</code></a></em></li><li><a href="/ja/docs/Web/API/Window/unload_event"><code>unload</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/vrdisplayactivate_event"><code>vrdisplayactivate</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/vrdisplayconnect_event"><code>vrdisplayconnect</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/vrdisplaydeactivate_event"><code>vrdisplaydeactivate</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/vrdisplaydisconnect_event"><code>vrdisplaydisconnect</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/Window/vrdisplaypresentchange_event"><code>vrdisplaypresentchange</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li></ol></details></li><li class="toggle"><details open=""><summary>継承</summary><ol><li><a href="/ja/docs/Web/API/EventTarget"><code>EventTarget</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>HTML DOM に関連するページ</summary><ol><li><a href="/ja/docs/Web/API/BeforeUnloadEvent"><code>BeforeUnloadEvent</code></a></li><li><a href="/ja/docs/Web/API/DOMStringMap"><code>DOMStringMap</code></a></li><li><a href="/ja/docs/Web/API/ErrorEvent"><code>ErrorEvent</code></a></li><li><a href="/ja/docs/Web/API/HTMLAnchorElement"><code>HTMLAnchorElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLAreaElement"><code>HTMLAreaElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLAudioElement"><code>HTMLAudioElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLBRElement"><code>HTMLBRElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLBaseElement"><code>HTMLBaseElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLBodyElement"><code>HTMLBodyElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLButtonElement"><code>HTMLButtonElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLCanvasElement"><code>HTMLCanvasElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLDListElement"><code>HTMLDListElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLDataElement"><code>HTMLDataElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLDataListElement"><code>HTMLDataListElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLDialogElement"><code>HTMLDialogElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLDivElement"><code>HTMLDivElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLDocument"><code>HTMLDocument</code></a></li><li><a href="/ja/docs/Web/API/HTMLElement"><code>HTMLElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLEmbedElement"><code>HTMLEmbedElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLFieldSetElement"><code>HTMLFieldSetElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLFormControlsCollection"><code>HTMLFormControlsCollection</code></a></li><li><a href="/ja/docs/Web/API/HTMLFormElement"><code>HTMLFormElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLFrameSetElement"><code>HTMLFrameSetElement</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/HTMLHRElement"><code>HTMLHRElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLHeadElement"><code>HTMLHeadElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLHeadingElement"><code>HTMLHeadingElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLHtmlElement"><code>HTMLHtmlElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLIFrameElement"><code>HTMLIFrameElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLImageElement"><code>HTMLImageElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLInputElement"><code>HTMLInputElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLLIElement"><code>HTMLLIElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLLabelElement"><code>HTMLLabelElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLLegendElement"><code>HTMLLegendElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLLinkElement"><code>HTMLLinkElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLMapElement"><code>HTMLMapElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLMediaElement"><code>HTMLMediaElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLMenuElement"><code>HTMLMenuElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLMetaElement"><code>HTMLMetaElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLMeterElement"><code>HTMLMeterElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLModElement"><code>HTMLModElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLOListElement"><code>HTMLOListElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLObjectElement"><code>HTMLObjectElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLOptGroupElement"><code>HTMLOptGroupElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLOptionElement"><code>HTMLOptionElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLOptionsCollection"><code>HTMLOptionsCollection</code></a></li><li><a href="/ja/docs/Web/API/HTMLOutputElement"><code>HTMLOutputElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLParagraphElement"><code>HTMLParagraphElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLPictureElement"><code>HTMLPictureElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLPreElement"><code>HTMLPreElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLProgressElement"><code>HTMLProgressElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLQuoteElement"><code>HTMLQuoteElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLScriptElement"><code>HTMLScriptElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLSelectElement"><code>HTMLSelectElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLSourceElement"><code>HTMLSourceElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLSpanElement"><code>HTMLSpanElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLStyleElement"><code>HTMLStyleElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTableCaptionElement"><code>HTMLTableCaptionElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTableCellElement"><code>HTMLTableCellElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTableColElement"><code>HTMLTableColElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTableElement"><code>HTMLTableElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTableRowElement"><code>HTMLTableRowElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTableSectionElement"><code>HTMLTableSectionElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTemplateElement"><code>HTMLTemplateElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTextAreaElement"><code>HTMLTextAreaElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTimeElement"><code>HTMLTimeElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTitleElement"><code>HTMLTitleElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLTrackElement"><code>HTMLTrackElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLUListElement"><code>HTMLUListElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLUnknownElement"><code>HTMLUnknownElement</code></a></li><li><a href="/ja/docs/Web/API/HTMLVideoElement"><code>HTMLVideoElement</code></a></li><li><a href="/ja/docs/Web/API/HashChangeEvent"><code>HashChangeEvent</code></a></li><li><a href="/ja/docs/Web/API/History"><code>History</code></a></li><li><a href="/ja/docs/Web/API/ImageData"><code>ImageData</code></a></li><li><a href="/ja/docs/Web/API/Location"><code>Location</code></a></li><li><a href="/ja/docs/Web/API/MessageChannel"><code>MessageChannel</code></a></li><li><a href="/ja/docs/Web/API/MessageEvent"><code>MessageEvent</code></a></li><li><a href="/ja/docs/Web/API/MessagePort"><code>MessagePort</code></a></li><li><a href="/ja/docs/Web/API/Navigator"><code>Navigator</code></a></li><li><a href="/ja/docs/Web/API/PageRevealEvent"><code>PageRevealEvent</code></a></li><li><a href="/ja/docs/Web/API/PageSwapEvent"><code>PageSwapEvent</code></a></li><li><a href="/ja/docs/Web/API/PageTransitionEvent"><code>PageTransitionEvent</code></a></li><li><a href="/ja/docs/Web/API/Plugin"><code>Plugin</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/PluginArray"><code>PluginArray</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/PromiseRejectionEvent"><code>PromiseRejectionEvent</code></a></li><li><a href="/ja/docs/Web/API/RadioNodeList"><code>RadioNodeList</code></a></li><li><a href="/ja/docs/Web/API/UserActivation"><code>UserActivation</code></a></li><li><a href="/ja/docs/Web/API/ValidityState"><code>ValidityState</code></a></li><li><a href="/ja/docs/Web/API/WorkletGlobalScope"><code>WorkletGlobalScope</code></a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">この記事では</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#使用上のメモ">使用上のメモ</a></li><li class="document-toc-item "><a class="document-toc-link" href="#例">例</a></li><li class="document-toc-item "><a class="document-toc-link" href="#仕様書">仕様書</a></li><li class="document-toc-item "><a class="document-toc-link" href="#ブラウザーの互換性">ブラウザーの互換性</a></li><li class="document-toc-item "><a class="document-toc-link" href="#関連情報">関連情報</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="ja"><header><h1>Window: unhandledrejection イベント</h1></header><div class="section-content"><p><strong><code>unhandledrejection</code></strong> イベントは、 JavaScript の拒否ハンドラーを持たない <a href="/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a> が拒否されたときにスクリプトのグローバルスコープに送られます。通常、これは <a href="/ja/docs/Web/API/Window"><code>window</code></a> ですが、 <a href="/ja/docs/Web/API/Worker"><code>Worker</code></a> であることもあります。これはデバッグや、予期しない場面でのエラーハンドリングのエラーの代替手段を提供するために利用することができます。</p> <figure class="table-container"><table class="properties"> <tbody> <tr> <th scope="row">バブリング</th> <td>なし</td> </tr> <tr> <th scope="row">キャンセル</th> <td>可</td> </tr> <tr> <th scope="row">インターフェイス</th> <td><a href="/ja/docs/Web/API/PromiseRejectionEvent"><code>PromiseRejectionEvent</code></a></td> </tr> <tr> <th scope="row">イベントハンドラープロパティ</th> <td> <a href="/ja/docs/Web/API/Window/unhandledrejection_event" title="onunhandledrejection" aria-current="page"><code>onunhandledrejection</code></a> </td> </tr> </tbody> </table></figure></div><section aria-labelledby="使用上のメモ"><h2 id="使用上のメモ"><a href="#使用上のメモ">使用上のメモ</a></h2><div class="section-content"><p><code>unhandledrejection</code> イベントにバブリングを許すと、結局はコンソールにエラーメッセージを出力することになります。これは <a href="/ja/docs/Web/API/PromiseRejectionEvent"><code>PromiseRejectionEvent</code></a> の <a href="/ja/docs/Web/API/Event/preventDefault" title="preventDefault()"><code>preventDefault()</code></a> を呼び出すことで防ぐことができます。例は以下の <a href="#preventing_default_handling">Preventing default handling</a> を参照してください。</p></div></section><section aria-labelledby="例"><h2 id="例"><a href="#例">例</a></h2><div class="section-content"><p>ここで <code>unhandledrejection</code> イベントの使い方が分かる例をいくつか見てみましょう。イベントには 2 つの有用な情報があります。</p> <dl> <dt id="promise"><a href="#promise"><code>promise</code></a></dt> <dd> <p>拒否を扱うために利用できるハンドラーがなく拒否された実際の <a href="/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a> です。</p> </dd> <dt id="reason"><a href="#reason"><code>reason</code></a></dt> <dd> <p>拒否ハンドラーに渡されるはずだった理由です。詳しくは <a href="/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise/catch"><code>catch()</code></a> を参照してください。</p> </dd> </dl></div></section><section aria-labelledby="基本的なエラーのログ"><h3 id="基本的なエラーのログ"><a href="#基本的なエラーのログ">基本的なエラーのログ</a></h3><div class="section-content"><p>この例では、処理されなかった Promise の拒否についての情報を単純にコンソールにログ出力します。</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>window.addEventListener("unhandledrejection", (event) => { console.warn(`UNHANDLED PROMISE REJECTION: ${event.reason}`); }); </code></pre></div> <p>イベントハンドラープロパティを使用して、イベントリスナーを設定することもできます。</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>window.onunhandledrejection = (event) => { console.warn(`UNHANDLED PROMISE REJECTION: ${event.reason}`); }; </code></pre></div></div></section><section aria-labelledby="既定のハンドリングの防止"><h3 id="既定のハンドリングの防止"><a href="#既定のハンドリングの防止">既定のハンドリングの防止</a></h3><div class="section-content"><p>(<a href="/ja/docs/Glossary/Node.js">Node.js</a> など) 多くの環境では、既定では処理されなかった Promise の拒否はコンソールに報告されます。 <code>unhandledrejection</code> イベントのハンドラー — と、さらに実行したいその他のタスク — を追加して、 <a href="/ja/docs/Web/API/Event/preventDefault" title="preventDefault()"><code>preventDefault()</code></a> を呼び出すことでイベントをキャンセルし、実行時のログ出力コードが扱われるまでバブリングすることを防ぐことができます。これは <code>unhandledrejection</code> がキャンセル可能であるためです。</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>window.addEventListener("unhandledrejection", function (event) { // ...your code here to handle the unhandled rejection... // Prevent the default handling (such as outputting the // error to the console event.preventDefault(); }); </code></pre></div></div></section><h2 id="仕様書"><a href="#仕様書">仕様書</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://html.spec.whatwg.org/multipage/indices.html#event-unhandledrejection">HTML <br/><small># event-unhandledrejection</small></a></td></tr><tr><td><a href="https://html.spec.whatwg.org/multipage/webappapis.html#handler-window-onunhandledrejection">HTML <br/><small># handler-window-onunhandledrejection</small></a></td></tr></tbody></table><h2 id="ブラウザーの互換性"><a href="#ブラウザーの互換性">ブラウザーの互換性</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="関連情報"><h2 id="関連情報"><a href="#関連情報">関連情報</a></h2><div class="section-content"><ul> <li><a href="/ja/docs/Web/JavaScript/Guide/Using_promises#%E3%83%97%E3%83%AD%E3%83%9F%E3%82%B9%E3%81%AE%E6%8B%92%E5%90%A6%E3%82%A4%E3%83%99%E3%83%B3%E3%83%88">プロミスの拒否イベント</a></li> <li><a href="/ja/docs/Web/API/Window/unhandledrejection_event" title="onunhandledrejection" aria-current="page"><code>onunhandledrejection</code></a> イベントハンドラープロパティ<a href="#seealso-footnote-1">1</a></li> <li><a href="/ja/docs/Web/API/Window/rejectionhandled_event" title="rejectionhandled"><code>rejectionhandled</code></a> イベント</li> <li><a href="/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a></li> </ul> <p>[1] 対応するイベントハンドラープロパティは、<a class="page-not-created" data-href="/ja/docs/Web/API/WindowEventHandlers" title="この項目についての文書はまだ書かれていません。書いてみませんか？"><code>WindowEventHandlers</code></a> ミックスインで定義されています。これは、<a href="/ja/docs/Web/API/Window"><code>Window</code></a> インターフェイスとすべての種類の <a href="/ja/docs/Web/API/Worker"><code>Worker</code></a> インターフェイスの両方で使用できます。</p></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 10.603-11.389 13.606-18.467a48.14 48.14 0 0 0 3.712-22.352c-.561-7.625-2.938-15.025-6.948-21.625s-9.544-12.226-16.175-16.44-14.181-6.904-22.065-7.863a53.75 53.75 0 0 0-23.405 2.336c-7.513 2.495-14.327 6.62-19.918 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class="footer-moz-link" target="_blank" rel="noopener noreferrer">Cookies</a></li><li class="footer-moz-item"><a href="https://www.mozilla.org/about/legal/terms/mozilla" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Legal</a></li><li class="footer-moz-item"><a href="https://www.mozilla.org/about/governance/policies/participation/" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Community Participation Guidelines</a></li></ul></div><div class="page-footer-legal"><p id="license" class="page-footer-legal-text">Visit <a href="https://www.mozilla.org" target="_blank" rel="noopener noreferrer">Mozilla Corporation’s</a> not-for-profit parent, the <a target="_blank" rel="noopener noreferrer" href="https://foundation.mozilla.org/">Mozilla Foundation</a>.<br/>Portions of this content are ©1998–2025 by individual mozilla.org contributors. Content available under <a href="/ja/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/ja/docs/Web/API/Window/unhandledrejection_event","doc":{"body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p><strong><code>unhandledrejection</code></strong> イベントは、 JavaScript の拒否ハンドラーを持たない <a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a> が拒否されたときにスクリプトのグローバルスコープに送られます。通常、これは <a href=\"/ja/docs/Web/API/Window\"><code>window</code></a> ですが、 <a href=\"/ja/docs/Web/API/Worker\"><code>Worker</code></a> であることもあります。これはデバッグや、予期しない場面でのエラーハンドリングのエラーの代替手段を提供するために利用することができます。</p>\n<figure class=\"table-container\"><table class=\"properties\">\n <tbody>\n <tr>\n <th scope=\"row\">バブリング</th>\n <td>なし</td>\n </tr>\n <tr>\n <th scope=\"row\">キャンセル</th>\n <td>可</td>\n </tr>\n <tr>\n <th scope=\"row\">インターフェイス</th>\n <td><a href=\"/ja/docs/Web/API/PromiseRejectionEvent\"><code>PromiseRejectionEvent</code></a></td>\n </tr>\n <tr>\n <th scope=\"row\">イベントハンドラープロパティ</th>\n <td>\n <a href=\"/ja/docs/Web/API/Window/unhandledrejection_event\" title=\"onunhandledrejection\" aria-current=\"page\"><code>onunhandledrejection</code></a>\n </td>\n </tr>\n </tbody>\n</table></figure>"}},{"type":"prose","value":{"id":"使用上のメモ","title":"使用上のメモ","isH3":false,"content":"<p><code>unhandledrejection</code> イベントにバブリングを許すと、結局はコンソールにエラーメッセージを出力することになります。これは <a href=\"/ja/docs/Web/API/PromiseRejectionEvent\"><code>PromiseRejectionEvent</code></a> の <a href=\"/ja/docs/Web/API/Event/preventDefault\" title=\"preventDefault()\"><code>preventDefault()</code></a> を呼び出すことで防ぐことができます。例は以下の <a href=\"#preventing_default_handling\">Preventing default handling</a> を参照してください。</p>"}},{"type":"prose","value":{"id":"例","title":"例","isH3":false,"content":"<p>ここで <code>unhandledrejection</code> イベントの使い方が分かる例をいくつか見てみましょう。イベントには 2 つの有用な情報があります。</p>\n<dl>\n<dt id=\"promise\"><a href=\"#promise\"><code>promise</code></a></dt>\n<dd>\n<p>拒否を扱うために利用できるハンドラーがなく拒否された実際の <a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a> です。</p>\n</dd>\n<dt id=\"reason\"><a href=\"#reason\"><code>reason</code></a></dt>\n<dd>\n<p>拒否ハンドラーに渡されるはずだった理由です。詳しくは <a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise/catch\"><code>catch()</code></a> を参照してください。</p>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"基本的なエラーのログ","title":"基本的なエラーのログ","isH3":true,"content":"<p>この例では、処理されなかった Promise の拒否についての情報を単純にコンソールにログ出力します。</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>window.addEventListener(\"unhandledrejection\", (event) => {\n console.warn(`UNHANDLED PROMISE REJECTION: ${event.reason}`);\n});\n</code></pre></div>\n<p>イベントハンドラープロパティを使用して、イベントリスナーを設定することもできます。</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>window.onunhandledrejection = (event) => {\n console.warn(`UNHANDLED PROMISE REJECTION: ${event.reason}`);\n};\n</code></pre></div>"}},{"type":"prose","value":{"id":"既定のハンドリングの防止","title":"既定のハンドリングの防止","isH3":true,"content":"<p>(<a href=\"/ja/docs/Glossary/Node.js\">Node.js</a> など) 多くの環境では、既定では処理されなかった Promise の拒否はコンソールに報告されます。 <code>unhandledrejection</code> イベントのハンドラー — と、さらに実行したいその他のタスク — を追加して、 <a href=\"/ja/docs/Web/API/Event/preventDefault\" title=\"preventDefault()\"><code>preventDefault()</code></a> を呼び出すことでイベントをキャンセルし、実行時のログ出力コードが扱われるまでバブリングすることを防ぐことができます。これは <code>unhandledrejection</code> がキャンセル可能であるためです。</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>window.addEventListener(\"unhandledrejection\", function (event) {\n // ...your code here to handle the unhandled rejection...\n\n // Prevent the default handling (such as outputting the\n // error to the console\n\n event.preventDefault();\n});\n</code></pre></div>"}},{"type":"specifications","value":{"id":"仕様書","title":"仕様書","isH3":false,"specifications":[{"bcdSpecificationURL":"https://html.spec.whatwg.org/multipage/indices.html#event-unhandledrejection","title":"HTML"},{"bcdSpecificationURL":"https://html.spec.whatwg.org/multipage/webappapis.html#handler-window-onunhandledrejection","title":"HTML"}],"query":"api.Window.unhandledrejection_event"}},{"type":"browser_compatibility","value":{"id":"ブラウザーの互換性","title":"ブラウザーの互換性","isH3":false,"query":"api.Window.unhandledrejection_event"}},{"type":"prose","value":{"id":"関連情報","title":"関連情報","isH3":false,"content":"<ul>\n<li><a href=\"/ja/docs/Web/JavaScript/Guide/Using_promises#%E3%83%97%E3%83%AD%E3%83%9F%E3%82%B9%E3%81%AE%E6%8B%92%E5%90%A6%E3%82%A4%E3%83%99%E3%83%B3%E3%83%88\">プロミスの拒否イベント</a></li>\n<li><a href=\"/ja/docs/Web/API/Window/unhandledrejection_event\" title=\"onunhandledrejection\" aria-current=\"page\"><code>onunhandledrejection</code></a> イベントハンドラープロパティ<a href=\"#seealso-footnote-1\">1</a></li>\n<li><a href=\"/ja/docs/Web/API/Window/rejectionhandled_event\" title=\"rejectionhandled\"><code>rejectionhandled</code></a> イベント</li>\n<li><a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a></li>\n</ul>\n<p>[1] 対応するイベントハンドラープロパティは、<a class=\"page-not-created\" data-href=\"/ja/docs/Web/API/WindowEventHandlers\" title=\"この項目についての文書はまだ書かれていません。書いてみませんか？\"><code>WindowEventHandlers</code></a> ミックスインで定義されています。これは、<a href=\"/ja/docs/Web/API/Window\"><code>Window</code></a> インターフェイスとすべての種類の <a href=\"/ja/docs/Web/API/Worker\"><code>Worker</code></a> インターフェイスの両方で使用できます。</p>"}}],"isActive":true,"isMarkdown":true,"isTranslated":true,"locale":"ja","mdn_url":"/ja/docs/Web/API/Window/unhandledrejection_event","modified":"2023-11-08T14:55:52.000Z","native":"日本語","noIndexing":false,"other_translations":[{"locale":"en-US","title":"Window: unhandledrejection event","native":"English (US)"},{"locale":"de","title":"Window: unhandledrejection-Ereignis","native":"Deutsch"},{"locale":"ru","title":"unhandledrejection","native":"Русский"},{"locale":"zh-CN","title":"unhandledrejection","native":"中文 (简体)"}],"pageTitle":"Window: unhandledrejection イベント - Web API | MDN","parents":[{"uri":"/ja/docs/Web","title":"開発者向けのウェブ技術"},{"uri":"/ja/docs/Web/API","title":"Web API"},{"uri":"/ja/docs/Web/API/Window","title":"Window"},{"uri":"/ja/docs/Web/API/Window/unhandledrejection_event","title":"Window: unhandledrejection イベント"}],"popularity":null,"short_title":"Window: unhandledrejection イベント","sidebarHTML":"<ol><li class=\"section\"><a href=\"/ja/docs/Web/API/HTML_DOM_API\">HTML DOM API</a></li><li class=\"section\"><a href=\"/ja/docs/Web/API/Window\"><code>Window</code></a></li><li class=\"toggle\"><details open=\"\"><summary>インスタンスプロパティ</summary><ol><li><a href=\"/ja/docs/Web/API/Window/caches\"><code>caches</code></a></li><li><a href=\"/ja/docs/Web/API/Window/closed\"><code>closed</code></a></li><li><a href=\"/ja/docs/Web/API/Window/cookieStore\"><code>cookieStore</code></a></li><li><a href=\"/ja/docs/Web/API/Window/credentialless\"><code>credentialless</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/crossOriginIsolated\"><code>crossOriginIsolated</code></a></li><li><a href=\"/ja/docs/Web/API/Window/crypto\"><code>crypto</code></a></li><li><a href=\"/ja/docs/Web/API/Window/customElements\"><code>customElements</code></a></li><li><a href=\"/ja/docs/Web/API/Window/devicePixelRatio\"><code>devicePixelRatio</code></a></li><li><a href=\"/ja/docs/Web/API/Window/document\"><code>document</code></a></li><li><a href=\"/ja/docs/Web/API/Window/documentPictureInPicture\"><code>documentPictureInPicture</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/event\"><code>event</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/external\"><code>external</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Window/fence\" class=\"only-in-en-us\"><code>fence</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/frameElement\"><code>frameElement</code></a></li><li><a href=\"/ja/docs/Web/API/Window/frames\"><code>frames</code></a></li><li><a href=\"/ja/docs/Web/API/Window/fullScreen\"><code>fullScreen</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/history\"><code>history</code></a></li><li><a href=\"/ja/docs/Web/API/Window/indexedDB\"><code>indexedDB</code></a></li><li><a href=\"/ja/docs/Web/API/Window/innerHeight\"><code>innerHeight</code></a></li><li><a href=\"/ja/docs/Web/API/Window/innerWidth\"><code>innerWidth</code></a></li><li><a href=\"/ja/docs/Web/API/Window/isSecureContext\"><code>isSecureContext</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/launchQueue\" class=\"only-in-en-us\"><code>launchQueue</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/length\"><code>length</code></a></li><li><a href=\"/ja/docs/Web/API/Window/localStorage\"><code>localStorage</code></a></li><li><a href=\"/ja/docs/Web/API/Window/location\"><code>location</code></a></li><li><a href=\"/ja/docs/Web/API/Window/locationbar\"><code>locationbar</code></a></li><li><a href=\"/ja/docs/Web/API/Window/menubar\"><code>menubar</code></a></li><li><a href=\"/ja/docs/Web/API/Window/mozInnerScreenX\"><code>mozInnerScreenX</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/mozInnerScreenY\"><code>mozInnerScreenY</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/name\"><code>name</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/navigation\" class=\"only-in-en-us\"><code>navigation</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/navigator\"><code>navigator</code></a></li><li><a href=\"/ja/docs/Web/API/Window/opener\"><code>opener</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/orientation\" class=\"only-in-en-us\"><code>orientation</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/origin\"><code>origin</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/originAgentCluster\" class=\"only-in-en-us\"><code>originAgentCluster</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/outerHeight\"><code>outerHeight</code></a></li><li><a href=\"/ja/docs/Web/API/Window/outerWidth\"><code>outerWidth</code></a></li><li><a href=\"/ja/docs/Web/API/Window/parent\"><code>parent</code></a></li><li><a href=\"/ja/docs/Web/API/Window/performance\"><code>performance</code></a></li><li><a href=\"/ja/docs/Web/API/Window/personalbar\"><code>personalbar</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/scheduler\" class=\"only-in-en-us\"><code>scheduler</code></a></li><li><a href=\"/ja/docs/Web/API/Window/screen\"><code>screen</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/screenLeft\" class=\"only-in-en-us\"><code>screenLeft</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/screenTop\" class=\"only-in-en-us\"><code>screenTop</code></a></li><li><a href=\"/ja/docs/Web/API/Window/screenX\"><code>screenX</code></a></li><li><a href=\"/ja/docs/Web/API/Window/screenY\"><code>screenY</code></a></li><li><a href=\"/ja/docs/Web/API/Window/scrollbars\"><code>scrollbars</code></a></li><li><a href=\"/ja/docs/Web/API/Window/scrollMaxX\"><code>scrollMaxX</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/scrollMaxY\"><code>scrollMaxY</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/scrollX\"><code>scrollX</code></a></li><li><a href=\"/ja/docs/Web/API/Window/scrollY\"><code>scrollY</code></a></li><li><a href=\"/ja/docs/Web/API/Window/self\"><code>self</code></a></li><li><a href=\"/ja/docs/Web/API/Window/sessionStorage\"><code>sessionStorage</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/sharedStorage\" class=\"only-in-en-us\"><code>sharedStorage</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/speechSynthesis\"><code>speechSynthesis</code></a></li><li><a href=\"/ja/docs/Web/API/Window/status\"><code>status</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/statusbar\"><code>statusbar</code></a></li><li><a href=\"/ja/docs/Web/API/Window/toolbar\"><code>toolbar</code></a></li><li><a href=\"/ja/docs/Web/API/Window/top\"><code>top</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/trustedTypes\" class=\"only-in-en-us\"><code>trustedTypes</code></a></li><li><a href=\"/ja/docs/Web/API/Window/visualViewport\"><code>visualViewport</code></a></li><li><a href=\"/ja/docs/Web/API/Window/window\"><code>window</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>インスタンスメソッド</summary><ol><li><a href=\"/ja/docs/Web/API/Window/alert\"><code>alert()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/atob\"><code>atob()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/back\"><code>back()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/blur\"><code>blur()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/btoa\"><code>btoa()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/cancelAnimationFrame\"><code>cancelAnimationFrame()</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/cancelIdleCallback\" class=\"only-in-en-us\"><code>cancelIdleCallback()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/captureEvents\"><code>captureEvents()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Window/clearImmediate\" class=\"only-in-en-us\"><code>clearImmediate()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/clearInterval\"><code>clearInterval()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/clearTimeout\"><code>clearTimeout()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/close\"><code>close()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/confirm\"><code>confirm()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/createImageBitmap\"><code>createImageBitmap()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/dump\"><code>dump()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/fetch\"><code>fetch()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/find\"><code>find()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/focus\"><code>focus()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/forward\"><code>forward()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/getComputedStyle\"><code>getComputedStyle()</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/getDefaultComputedStyle\" class=\"only-in-en-us\"><code>getDefaultComputedStyle()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/getScreenDetails\"><code>getScreenDetails()</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/getSelection\"><code>getSelection()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/matchMedia\"><code>matchMedia()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/moveBy\"><code>moveBy()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/moveTo\"><code>moveTo()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/open\"><code>open()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/postMessage\"><code>postMessage()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/print\"><code>print()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/prompt\"><code>prompt()</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/queryLocalFonts\" class=\"only-in-en-us\"><code>queryLocalFonts()</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/queueMicrotask\"><code>queueMicrotask()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/releaseEvents\"><code>releaseEvents()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/reportError\"><code>reportError()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/requestAnimationFrame\"><code>requestAnimationFrame()</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/requestFileSystem\" class=\"only-in-en-us\"><code>requestFileSystem()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/requestIdleCallback\"><code>requestIdleCallback()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/resizeBy\"><code>resizeBy()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/resizeTo\"><code>resizeTo()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/scroll\"><code>scroll()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/scrollBy\"><code>scrollBy()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/scrollByLines\"><code>scrollByLines()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/scrollByPages\"><code>scrollByPages()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/scrollTo\"><code>scrollTo()</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/setImmediate\" class=\"only-in-en-us\"><code>setImmediate()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/setInterval\"><code>setInterval()</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/setResizable\" class=\"only-in-en-us\"><code>setResizable()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/setTimeout\"><code>setTimeout()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/showDirectoryPicker\"><code>showDirectoryPicker()</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/showModalDialog\"><code>showModalDialog()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/showOpenFilePicker\"><code>showOpenFilePicker()</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/showSaveFilePicker\"><code>showSaveFilePicker()</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/sizeToContent\"><code>sizeToContent()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/stop\"><code>stop()</code></a></li><li><a href=\"/ja/docs/Web/API/Window/structuredClone\"><code>structuredClone()</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/webkitConvertPointFromNodeToPage\" class=\"only-in-en-us\"><code>webkitConvertPointFromNodeToPage()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Window/webkitConvertPointFromPageToNode\" class=\"only-in-en-us\"><code>webkitConvertPointFromPageToNode()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>イベント</summary><ol><li><a href=\"/ja/docs/Web/API/Window/afterprint_event\"><code>afterprint</code></a></li><li><a href=\"/ja/docs/Web/API/Window/appinstalled_event\"><code>appinstalled</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/beforeinstallprompt_event\" class=\"only-in-en-us\"><code>beforeinstallprompt</code></a></li><li><a href=\"/ja/docs/Web/API/Window/beforeprint_event\"><code>beforeprint</code></a></li><li><a href=\"/ja/docs/Web/API/Window/beforeunload_event\"><code>beforeunload</code></a></li><li><a href=\"/ja/docs/Web/API/Window/blur_event\"><code>blur</code></a></li><li><a href=\"/ja/docs/Web/API/Window/copy_event\"><code>copy</code></a></li><li><a href=\"/ja/docs/Web/API/Window/cut_event\"><code>cut</code></a></li><li><a href=\"/ja/docs/Web/API/Window/devicemotion_event\"><code>devicemotion</code></a></li><li><a href=\"/ja/docs/Web/API/Window/deviceorientation_event\"><code>deviceorientation</code></a></li><li><a href=\"/ja/docs/Web/API/Window/deviceorientationabsolute_event\"><code>deviceorientationabsolute</code></a></li><li><a href=\"/ja/docs/Web/API/Window/error_event\"><code>error</code></a></li><li><a href=\"/ja/docs/Web/API/Window/focus_event\"><code>focus</code></a></li><li><a href=\"/ja/docs/Web/API/Window/gamepadconnected_event\"><code>gamepadconnected</code></a></li><li><a href=\"/ja/docs/Web/API/Window/gamepaddisconnected_event\"><code>gamepaddisconnected</code></a></li><li><a href=\"/ja/docs/Web/API/Window/hashchange_event\"><code>hashchange</code></a></li><li><a href=\"/ja/docs/Web/API/Window/languagechange_event\"><code>languagechange</code></a></li><li><a href=\"/ja/docs/Web/API/Window/load_event\"><code>load</code></a></li><li><a href=\"/ja/docs/Web/API/Window/message_event\"><code>message</code></a></li><li><a href=\"/ja/docs/Web/API/Window/messageerror_event\"><code>messageerror</code></a></li><li><a href=\"/ja/docs/Web/API/Window/offline_event\"><code>offline</code></a></li><li><a href=\"/ja/docs/Web/API/Window/online_event\"><code>online</code></a></li><li><a href=\"/ja/docs/Web/API/Window/orientationchange_event\"><code>orientationchange</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/pagehide_event\"><code>pagehide</code></a></li><li><a href=\"/ja/docs/Web/API/Window/pagereveal_event\"><code>pagereveal</code></a></li><li><a href=\"/ja/docs/Web/API/Window/pageshow_event\"><code>pageshow</code></a></li><li><a href=\"/ja/docs/Web/API/Window/pageswap_event\"><code>pageswap</code></a></li><li><a href=\"/ja/docs/Web/API/Window/paste_event\"><code>paste</code></a></li><li><a href=\"/ja/docs/Web/API/Window/popstate_event\"><code>popstate</code></a></li><li><a href=\"/ja/docs/Web/API/Window/rejectionhandled_event\"><code>rejectionhandled</code></a></li><li><a href=\"/ja/docs/Web/API/Window/resize_event\"><code>resize</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/scrollsnapchange_event\" class=\"only-in-en-us\"><code>scrollsnapchange</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Window/scrollsnapchanging_event\" class=\"only-in-en-us\"><code>scrollsnapchanging</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/storage_event\"><code>storage</code></a></li><li><em><a href=\"/ja/docs/Web/API/Window/unhandledrejection_event\" aria-current=\"page\"><code>unhandledrejection</code></a></em></li><li><a href=\"/ja/docs/Web/API/Window/unload_event\"><code>unload</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/vrdisplayactivate_event\"><code>vrdisplayactivate</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/vrdisplayconnect_event\"><code>vrdisplayconnect</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/vrdisplaydeactivate_event\"><code>vrdisplaydeactivate</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/vrdisplaydisconnect_event\"><code>vrdisplaydisconnect</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/Window/vrdisplaypresentchange_event\"><code>vrdisplaypresentchange</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>継承</summary><ol><li><a href=\"/ja/docs/Web/API/EventTarget\"><code>EventTarget</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>HTML DOM に関連するページ</summary><ol><li><a href=\"/ja/docs/Web/API/BeforeUnloadEvent\"><code>BeforeUnloadEvent</code></a></li><li><a href=\"/ja/docs/Web/API/DOMStringMap\"><code>DOMStringMap</code></a></li><li><a href=\"/ja/docs/Web/API/ErrorEvent\"><code>ErrorEvent</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLAnchorElement\"><code>HTMLAnchorElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLAreaElement\"><code>HTMLAreaElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLAudioElement\"><code>HTMLAudioElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLBRElement\"><code>HTMLBRElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLBaseElement\"><code>HTMLBaseElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLBodyElement\"><code>HTMLBodyElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLButtonElement\"><code>HTMLButtonElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLCanvasElement\"><code>HTMLCanvasElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLDListElement\"><code>HTMLDListElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLDataElement\"><code>HTMLDataElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLDataListElement\"><code>HTMLDataListElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLDialogElement\"><code>HTMLDialogElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLDivElement\"><code>HTMLDivElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLDocument\"><code>HTMLDocument</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLElement\"><code>HTMLElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLEmbedElement\"><code>HTMLEmbedElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLFieldSetElement\"><code>HTMLFieldSetElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLFormControlsCollection\"><code>HTMLFormControlsCollection</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLFormElement\"><code>HTMLFormElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLFrameSetElement\"><code>HTMLFrameSetElement</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/HTMLHRElement\"><code>HTMLHRElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLHeadElement\"><code>HTMLHeadElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLHeadingElement\"><code>HTMLHeadingElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLHtmlElement\"><code>HTMLHtmlElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLIFrameElement\"><code>HTMLIFrameElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLImageElement\"><code>HTMLImageElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLInputElement\"><code>HTMLInputElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLLIElement\"><code>HTMLLIElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLLabelElement\"><code>HTMLLabelElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLLegendElement\"><code>HTMLLegendElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLLinkElement\"><code>HTMLLinkElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLMapElement\"><code>HTMLMapElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLMediaElement\"><code>HTMLMediaElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLMenuElement\"><code>HTMLMenuElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLMetaElement\"><code>HTMLMetaElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLMeterElement\"><code>HTMLMeterElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLModElement\"><code>HTMLModElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLOListElement\"><code>HTMLOListElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLObjectElement\"><code>HTMLObjectElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLOptGroupElement\"><code>HTMLOptGroupElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLOptionElement\"><code>HTMLOptionElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLOptionsCollection\"><code>HTMLOptionsCollection</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLOutputElement\"><code>HTMLOutputElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLParagraphElement\"><code>HTMLParagraphElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLPictureElement\"><code>HTMLPictureElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLPreElement\"><code>HTMLPreElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLProgressElement\"><code>HTMLProgressElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLQuoteElement\"><code>HTMLQuoteElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLScriptElement\"><code>HTMLScriptElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLSelectElement\"><code>HTMLSelectElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLSourceElement\"><code>HTMLSourceElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLSpanElement\"><code>HTMLSpanElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLStyleElement\"><code>HTMLStyleElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTableCaptionElement\"><code>HTMLTableCaptionElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTableCellElement\"><code>HTMLTableCellElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTableColElement\"><code>HTMLTableColElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTableElement\"><code>HTMLTableElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTableRowElement\"><code>HTMLTableRowElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTableSectionElement\"><code>HTMLTableSectionElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTemplateElement\"><code>HTMLTemplateElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTextAreaElement\"><code>HTMLTextAreaElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTimeElement\"><code>HTMLTimeElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTitleElement\"><code>HTMLTitleElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLTrackElement\"><code>HTMLTrackElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLUListElement\"><code>HTMLUListElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLUnknownElement\"><code>HTMLUnknownElement</code></a></li><li><a href=\"/ja/docs/Web/API/HTMLVideoElement\"><code>HTMLVideoElement</code></a></li><li><a href=\"/ja/docs/Web/API/HashChangeEvent\"><code>HashChangeEvent</code></a></li><li><a href=\"/ja/docs/Web/API/History\"><code>History</code></a></li><li><a href=\"/ja/docs/Web/API/ImageData\"><code>ImageData</code></a></li><li><a href=\"/ja/docs/Web/API/Location\"><code>Location</code></a></li><li><a href=\"/ja/docs/Web/API/MessageChannel\"><code>MessageChannel</code></a></li><li><a href=\"/ja/docs/Web/API/MessageEvent\"><code>MessageEvent</code></a></li><li><a href=\"/ja/docs/Web/API/MessagePort\"><code>MessagePort</code></a></li><li><a href=\"/ja/docs/Web/API/Navigator\"><code>Navigator</code></a></li><li><a href=\"/ja/docs/Web/API/PageRevealEvent\"><code>PageRevealEvent</code></a></li><li><a href=\"/ja/docs/Web/API/PageSwapEvent\"><code>PageSwapEvent</code></a></li><li><a href=\"/ja/docs/Web/API/PageTransitionEvent\"><code>PageTransitionEvent</code></a></li><li><a href=\"/ja/docs/Web/API/Plugin\"><code>Plugin</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/PluginArray\"><code>PluginArray</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/PromiseRejectionEvent\"><code>PromiseRejectionEvent</code></a></li><li><a href=\"/ja/docs/Web/API/RadioNodeList\"><code>RadioNodeList</code></a></li><li><a href=\"/ja/docs/Web/API/UserActivation\"><code>UserActivation</code></a></li><li><a href=\"/ja/docs/Web/API/ValidityState\"><code>ValidityState</code></a></li><li><a href=\"/ja/docs/Web/API/WorkletGlobalScope\"><code>WorkletGlobalScope</code></a></li></ol></details></li></ol>","source":{"folder":"ja/web/api/window/unhandledrejection_event","github_url":"https://github.com/mdn/translated-content/blob/main/files/ja/web/api/window/unhandledrejection_event/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/808b7d39103c946ca1b7dd5edbe7afd203c92efd","filename":"index.md"},"summary":"unhandledrejection イベントは、 JavaScript の拒否ハンドラーを持たない Promise が拒否されたときにスクリプトのグローバルスコープに送られます。通常、これは window ですが、 Worker であることもあります。これはデバッグや、予期しない場面でのエラーハンドリングのエラーの代替手段を提供するために利用することができます。","title":"Window: unhandledrejection イベント","toc":[{"text":"使用上のメモ","id":"使用上のメモ"},{"text":"例","id":"例"},{"text":"仕様書","id":"仕様書"},{"text":"ブラウザーの互換性","id":"ブラウザーの互換性"},{"text":"関連情報","id":"関連情報"}],"browserCompat":["api.Window.unhandledrejection_event"],"pageType":"web-api-event"}}</script></body></html>