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Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/appCodeName"><code>appCodeName</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/appName"><code>appName</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/appVersion"><code>appVersion</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/bluetooth"><code>bluetooth</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/Navigator/buildID"><code>buildID</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/clipboard"><code>clipboard</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/connection"><code>connection</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/contacts"><code>contacts</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/Navigator/cookieEnabled"><code>cookieEnabled</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/credentials"><code>credentials</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/deviceMemory"><code>deviceMemory</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/doNotTrack"><code>doNotTrack</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/geolocation"><code>geolocation</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/globalPrivacyControl"><code>globalPrivacyControl</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/gpu"><code>gpu</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/Navigator/hardwareConcurrency"><code>hardwareConcurrency</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/hid"><code>hid</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/Navigator/ink"><code>ink</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/Navigator/keyboard"><code>keyboard</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/Navigator/language"><code>language</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/languages"><code>languages</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/locks"><code>locks</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/login"><code>login</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/Navigator/maxTouchPoints"><code>maxTouchPoints</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/mediaCapabilities"><code>mediaCapabilities</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/mediaDevices"><code>mediaDevices</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/mediaSession"><code>mediaSession</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/mimeTypes"><code>mimeTypes</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/onLine"><code>onLine</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/oscpu"><code>oscpu</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/pdfViewerEnabled"><code>pdfViewerEnabled</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/permissions"><code>permissions</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/platform"><code>platform</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/plugins"><code>plugins</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/presentation"><code>presentation</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/product"><code>product</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/productSub"><code>productSub</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/scheduling"><code>scheduling</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/Navigator/serial"><code>serial</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/Navigator/serviceWorker"><code>serviceWorker</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/storage"><code>storage</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/usb"><code>usb</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/userActivation"><code>userActivation</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/userAgent"><code>userAgent</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/userAgentData"><code>userAgentData</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/Navigator/vendor"><code>vendor</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/vendorSub"><code>vendorSub</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/virtualKeyboard"><code>virtualKeyboard</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/Navigator/wakeLock"><code>wakeLock</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/webdriver"><code>webdriver</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/windowControlsOverlay"><code>windowControlsOverlay</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/xr"><code>xr</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li></ol></details></li><li class="toggle"><details open=""><summary>Instance methods</summary><ol><li><a href="/en-US/docs/Web/API/Navigator/canShare"><code>canShare()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/clearAppBadge"><code>clearAppBadge()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/deprecatedReplaceInURN"><code>deprecatedReplaceInURN()</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/Navigator/getAutoplayPolicy"><code>getAutoplayPolicy()</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/Navigator/getBattery"><code>getBattery()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/getGamepads"><code>getGamepads()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/getInstalledRelatedApps"><code>getInstalledRelatedApps()</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/Navigator/getUserMedia"><code>getUserMedia()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/getVRDisplays"><code>getVRDisplays()</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/javaEnabled"><code>javaEnabled()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><em><code>registerProtocolHandler()</code> </em></li><li><a href="/en-US/docs/Web/API/Navigator/requestMediaKeySystemAccess"><code>requestMediaKeySystemAccess()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/requestMIDIAccess"><code>requestMIDIAccess()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/sendBeacon"><code>sendBeacon()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/setAppBadge"><code>setAppBadge()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/share"><code>share()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/taintEnabled"><code>taintEnabled()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/Navigator/unregisterProtocolHandler"><code>unregisterProtocolHandler()</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/vibrate"><code>vibrate()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Related pages for HTML DOM</summary><ol><li><a href="/en-US/docs/Web/API/BeforeUnloadEvent"><code>BeforeUnloadEvent</code></a></li><li><a href="/en-US/docs/Web/API/DOMStringMap"><code>DOMStringMap</code></a></li><li><a href="/en-US/docs/Web/API/ErrorEvent"><code>ErrorEvent</code></a></li><li><a href="/en-US/docs/Web/API/HTMLAnchorElement"><code>HTMLAnchorElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLAreaElement"><code>HTMLAreaElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLAudioElement"><code>HTMLAudioElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLBRElement"><code>HTMLBRElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLBaseElement"><code>HTMLBaseElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLBodyElement"><code>HTMLBodyElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLButtonElement"><code>HTMLButtonElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLCanvasElement"><code>HTMLCanvasElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLDListElement"><code>HTMLDListElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLDataElement"><code>HTMLDataElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLDataListElement"><code>HTMLDataListElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLDialogElement"><code>HTMLDialogElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLDivElement"><code>HTMLDivElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLDocument"><code>HTMLDocument</code></a></li><li><a href="/en-US/docs/Web/API/HTMLElement"><code>HTMLElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLEmbedElement"><code>HTMLEmbedElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLFieldSetElement"><code>HTMLFieldSetElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLFormControlsCollection"><code>HTMLFormControlsCollection</code></a></li><li><a href="/en-US/docs/Web/API/HTMLFormElement"><code>HTMLFormElement</code></a></li><li><a href="/en-US/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">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/HTMLHRElement"><code>HTMLHRElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLHeadElement"><code>HTMLHeadElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLHeadingElement"><code>HTMLHeadingElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLHtmlElement"><code>HTMLHtmlElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLIFrameElement"><code>HTMLIFrameElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLImageElement"><code>HTMLImageElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLInputElement"><code>HTMLInputElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLLIElement"><code>HTMLLIElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLLabelElement"><code>HTMLLabelElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLLegendElement"><code>HTMLLegendElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLLinkElement"><code>HTMLLinkElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMapElement"><code>HTMLMapElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMediaElement"><code>HTMLMediaElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMenuElement"><code>HTMLMenuElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMetaElement"><code>HTMLMetaElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLMeterElement"><code>HTMLMeterElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLModElement"><code>HTMLModElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLOListElement"><code>HTMLOListElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLObjectElement"><code>HTMLObjectElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLOptGroupElement"><code>HTMLOptGroupElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLOptionElement"><code>HTMLOptionElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLOptionsCollection"><code>HTMLOptionsCollection</code></a></li><li><a href="/en-US/docs/Web/API/HTMLOutputElement"><code>HTMLOutputElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLParagraphElement"><code>HTMLParagraphElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLPictureElement"><code>HTMLPictureElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLPreElement"><code>HTMLPreElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLProgressElement"><code>HTMLProgressElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLQuoteElement"><code>HTMLQuoteElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLScriptElement"><code>HTMLScriptElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLSelectElement"><code>HTMLSelectElement</code></a></li><li><a href="/en-US/docs/Web/API/HTMLSourceElement"><code>HTMLSourceElement</code></a></li><li><a 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Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/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">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/API/PromiseRejectionEvent"><code>PromiseRejectionEvent</code></a></li><li><a href="/en-US/docs/Web/API/RadioNodeList"><code>RadioNodeList</code></a></li><li><a href="/en-US/docs/Web/API/UserActivation"><code>UserActivation</code></a></li><li><a href="/en-US/docs/Web/API/ValidityState"><code>ValidityState</code></a></li><li><a href="/en-US/docs/Web/API/Window"><code>Window</code></a></li><li><a href="/en-US/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">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</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="en-US"><header><h1>Navigator: registerProtocolHandler() method</h1><details class="baseline-indicator not"><summary><span class="indicator" role="img" aria-label="Baseline Cross"></span><h2><span class="not-bold">Limited availability</span></h2><div class="browsers"><span class="engine" title="Not widely supported in Chrome, and supported in Edge"><span class="browser chrome " role="img" aria-label="Chrome cross"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Not widely supported in Firefox"><span class="browser firefox " role="img" aria-label="Firefox cross"></span></span><span class="engine" title="Not widely supported in Safari"><span class="browser safari " role="img" aria-label="Safari cross"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is not Baseline because it does not work in some of the most widely-used browsers.</p><ul><li><a href="/en-US/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#browser_compatibility" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fen-US%2Fdocs%2FWeb%2FAPI%2FNavigator%2FregisterProtocolHandler&level=not" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><div class="notecard secure"><p><strong>Secure context:</strong> This feature is available only in <a href="/en-US/docs/Web/Security/Secure_Contexts">secure contexts</a> (HTTPS), in some or all <a href="#browser_compatibility">supporting browsers</a>.</p></div> <p>The <strong><a href="/en-US/docs/Web/API/Navigator"><code>Navigator</code></a></strong> method <strong><code>registerProtocolHandler()</code></strong> lets websites register their ability to open or handle particular URL schemes (also known as protocols).</p> <p>For example, this API lets webmail sites open <code>mailto:</code> URLs, or VoIP sites open <code>tel:</code> URLs.</p> <p>To register a protocol handler, a website calls <code>registerProtocolHandler()</code>, passing in the protocol to register and a template URL.</p> <p>When the user activates a link that uses the registered protocol, the browser will insert the <a href="/en-US/docs/Web/HTML/Element/a#href"><code>href</code></a> from the activated link into the URL template supplied during handler registration, and navigate the current page to the resulting URL.</p> <p>The browser may ask the user to confirm that they want the page to be allowed to handle the protocol, either when the protocol is registered or when the user activates the link.</p></div><section aria-labelledby="syntax"><h2 id="syntax"><a href="#syntax">Syntax</a></h2><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>registerProtocolHandler(scheme, url) </code></pre></div></div></section><section aria-labelledby="parameters"><h3 id="parameters"><a href="#parameters">Parameters</a></h3><div class="section-content"><dl> <dt id="scheme"><a href="#scheme"><code>scheme</code></a></dt> <dd> <p>A string containing the scheme for the protocol that the site wishes to handle.</p> <p>This may be a custom scheme, in which case the scheme's name:</p> <ul> <li>Begins with <code>web+</code></li> <li>Contains at least one letter after the <code>web+</code> prefix</li> <li>Contains only lowercase <a href="/en-US/docs/Glossary/ASCII">ASCII</a> letters.</li> </ul> <p>Otherwise, the scheme must be one of the following:</p> <ul> <li><code>bitcoin</code></li> <li><code>ftp</code></li> <li><code>ftps</code></li> <li><code>geo</code></li> <li><code>im</code></li> <li><code>irc</code></li> <li><code>ircs</code></li> <li><code>magnet</code></li> <li><code>mailto</code></li> <li><code>matrix</code></li> <li><code>mms</code></li> <li><code>news</code></li> <li><code>nntp</code></li> <li><code>openpgp4fpr</code></li> <li><code>sftp</code></li> <li><code>sip</code></li> <li><code>sms</code></li> <li><code>smsto</code></li> <li><code>ssh</code></li> <li><code>tel</code></li> <li><code>urn</code></li> <li><code>webcal</code></li> <li><code>wtai</code></li> <li><code>xmpp</code></li> </ul> </dd> <dt id="url"><a href="#url"><code>url</code></a></dt> <dd> <p> A string containing the URL of the handler. This URL must include <code>%s</code>, as a placeholder that will be replaced with the <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent">escaped</a> URL to be handled. </p> <p>The handler URL must use the <code>https</code> scheme, and must be of the same <a href="/en-US/docs/Glossary/Origin">origin</a> as the webpage that is attempting to register the handler.</p> </dd> </dl></div></section><section aria-labelledby="return_value"><h3 id="return_value"><a href="#return_value">Return value</a></h3><div class="section-content"><p>None (<a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/undefined"><code>undefined</code></a>).</p></div></section><section aria-labelledby="exceptions"><h3 id="exceptions"><a href="#exceptions">Exceptions</a></h3><div class="section-content"><dl> <dt id="securityerror"><a href="#securityerror"><code>SecurityError</code></a> <a href="/en-US/docs/Web/API/DOMException"><code>DOMException</code></a></dt> <dd> <p> The user agent blocked the registration. This might happen if: </p> <ul> <li>The registered scheme (protocol) is invalid, such as a scheme the browser handles itself (<code>https:</code>, <code>about:</code>, etc.)</li> <li>The handler URL's <a href="/en-US/docs/Glossary/Origin">origin</a> does not match the origin of the page calling this API.</li> <li>The handler's URL's scheme is not <code>https</code>.</li> </ul> </dd> <dt id="syntaxerror"><a href="#syntaxerror"><code>SyntaxError</code></a> <a href="/en-US/docs/Web/API/DOMException"><code>DOMException</code></a></dt> <dd> <p>The <code>%s</code> placeholder is missing from the handler URL.</p> </dd> </dl></div></section><section aria-labelledby="examples"><h2 id="examples"><a href="#examples">Examples</a></h2><div class="section-content"></div></section><section aria-labelledby="registering_a_handler_for_the_mailto_protocol"><h3 id="registering_a_handler_for_the_mailto_protocol"><a href="#registering_a_handler_for_the_mailto_protocol">Registering a handler for the mailto protocol</a></h3><div class="section-content"><p>It's fairly common for web pages to link to resources using non-<code>https</code> protocols. An example is the <code>mailto:</code> protocol. Web authors can use a <code>mailto</code> link when they want to provide a convenient way for users to send an email directly from the webpage:</p> <div class="code-example"><div class="example-header"><span class="language-name">html</span></div><pre class="brush: html notranslate"><code><a href="mailto:webmaster@example.com">Web Master</a> </code></pre></div> <p>When the link is activated, the browser should launch the default desktop application for handling email. You can think of this as a <em>desktop-based</em> protocol handler.</p> <p>Web-based protocol handlers allow web-based applications to participate in the process too. An email web app at <code>mail.example.org</code> can register to handle <code>mailto</code> links with code like this:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>navigator.registerProtocolHandler("mailto", "https://mail.example.org/?to=%s"); </code></pre></div> <p>After this, when the user clicks a <code>mailto</code> link on any website, the browser will (after possibly asking the browser for confirmation) navigate to <code>https://mail.example.org/?to=mailto:webmaster@example.com</code>. This page could parse the URL parameter to extract the address, and use this to initialize an email.</p></div></section><section aria-labelledby="registering_a_handler_for_a_custom_protocol"><h3 id="registering_a_handler_for_a_custom_protocol"><a href="#registering_a_handler_for_a_custom_protocol">Registering a handler for a custom protocol</a></h3><div class="section-content"><p>In this example, a page registers a handler for the <code>web+burger</code> protocol with code like this:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>navigator.registerProtocolHandler( "web+burger", "https://burgers.example.org/?burger=%s", ); </code></pre></div> <p>Subsequently, the user visit a page containing a link like this:</p> <div class="code-example"><div class="example-header"><span class="language-name">html</span></div><pre class="brush: html notranslate"><code><a href="web+burger:cheeseburger">cheeseburger</a> </code></pre></div> <p>If the user activates the <code>web+burger</code> link, the browser will (after possibly asking the user for confirmation) navigate to <code>https://burgers.example.org/?burger=web+burger:cheeseburger</code>.</p></div></section><h2 id="specifications"><a href="#specifications">Specifications</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/system-state.html#custom-handlers">HTML Standard <br/><small># custom-handlers</small></a></td></tr></tbody></table><h2 id="browser_compatibility"><a href="#browser_compatibility">Browser compatibility</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. 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Content available under <a href="/en-US/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/en-US/docs/Web/API/Navigator/registerProtocolHandler","doc":{"isMarkdown":true,"isTranslated":false,"isActive":true,"flaws":{},"title":"Navigator: registerProtocolHandler() method","mdn_url":"/en-US/docs/Web/API/Navigator/registerProtocolHandler","locale":"en-US","native":"English (US)","browserCompat":["api.Navigator.registerProtocolHandler"],"baseline":{"baseline":false,"support":{"chrome":"38","edge":"79"}},"sidebarHTML":"<ol><li class=\"section\"><a href=\"/en-US/docs/Web/API/HTML_DOM_API\">HTML DOM API</a></li><li class=\"section\"><a href=\"/en-US/docs/Web/API/Navigator\"><code>Navigator</code></a></li><li class=\"toggle\"><details open=\"\"><summary>Instance properties</summary><ol><li><a href=\"/en-US/docs/Web/API/Navigator/activeVRDisplays\"><code>activeVRDisplays</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/appCodeName\"><code>appCodeName</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/appName\"><code>appName</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/appVersion\"><code>appVersion</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/bluetooth\"><code>bluetooth</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/Navigator/buildID\"><code>buildID</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/clipboard\"><code>clipboard</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/connection\"><code>connection</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/contacts\"><code>contacts</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/Navigator/cookieEnabled\"><code>cookieEnabled</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/credentials\"><code>credentials</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/deviceMemory\"><code>deviceMemory</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/doNotTrack\"><code>doNotTrack</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/geolocation\"><code>geolocation</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/globalPrivacyControl\"><code>globalPrivacyControl</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><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/gpu\"><code>gpu</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/Navigator/hardwareConcurrency\"><code>hardwareConcurrency</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/hid\"><code>hid</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/Navigator/ink\"><code>ink</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/Navigator/keyboard\"><code>keyboard</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/Navigator/language\"><code>language</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/languages\"><code>languages</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/locks\"><code>locks</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/login\"><code>login</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/Navigator/maxTouchPoints\"><code>maxTouchPoints</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/mediaCapabilities\"><code>mediaCapabilities</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/mediaDevices\"><code>mediaDevices</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/mediaSession\"><code>mediaSession</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/mimeTypes\"><code>mimeTypes</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/onLine\"><code>onLine</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/oscpu\"><code>oscpu</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/pdfViewerEnabled\"><code>pdfViewerEnabled</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/permissions\"><code>permissions</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/platform\"><code>platform</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/plugins\"><code>plugins</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/presentation\"><code>presentation</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/product\"><code>product</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/productSub\"><code>productSub</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/scheduling\"><code>scheduling</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/Navigator/serial\"><code>serial</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/Navigator/serviceWorker\"><code>serviceWorker</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/storage\"><code>storage</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/usb\"><code>usb</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/userActivation\"><code>userActivation</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/userAgent\"><code>userAgent</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/userAgentData\"><code>userAgentData</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/Navigator/vendor\"><code>vendor</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/vendorSub\"><code>vendorSub</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/virtualKeyboard\"><code>virtualKeyboard</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/Navigator/wakeLock\"><code>wakeLock</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/webdriver\"><code>webdriver</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/windowControlsOverlay\"><code>windowControlsOverlay</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/xr\"><code>xr</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></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Instance methods</summary><ol><li><a href=\"/en-US/docs/Web/API/Navigator/canShare\"><code>canShare()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/clearAppBadge\"><code>clearAppBadge()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/deprecatedReplaceInURN\"><code>deprecatedReplaceInURN()</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/Navigator/getAutoplayPolicy\"><code>getAutoplayPolicy()</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/Navigator/getBattery\"><code>getBattery()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/getGamepads\"><code>getGamepads()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/getInstalledRelatedApps\"><code>getInstalledRelatedApps()</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/Navigator/getUserMedia\"><code>getUserMedia()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/getVRDisplays\"><code>getVRDisplays()</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/javaEnabled\"><code>javaEnabled()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><em><code>registerProtocolHandler()</code> </em></li><li><a href=\"/en-US/docs/Web/API/Navigator/requestMediaKeySystemAccess\"><code>requestMediaKeySystemAccess()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/requestMIDIAccess\"><code>requestMIDIAccess()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/sendBeacon\"><code>sendBeacon()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/setAppBadge\"><code>setAppBadge()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/share\"><code>share()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/taintEnabled\"><code>taintEnabled()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/Navigator/unregisterProtocolHandler\"><code>unregisterProtocolHandler()</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/vibrate\"><code>vibrate()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Related pages for HTML DOM</summary><ol><li><a href=\"/en-US/docs/Web/API/BeforeUnloadEvent\"><code>BeforeUnloadEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/DOMStringMap\"><code>DOMStringMap</code></a></li><li><a href=\"/en-US/docs/Web/API/ErrorEvent\"><code>ErrorEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLAnchorElement\"><code>HTMLAnchorElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLAreaElement\"><code>HTMLAreaElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLAudioElement\"><code>HTMLAudioElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLBRElement\"><code>HTMLBRElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLBaseElement\"><code>HTMLBaseElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLBodyElement\"><code>HTMLBodyElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLButtonElement\"><code>HTMLButtonElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLCanvasElement\"><code>HTMLCanvasElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLDListElement\"><code>HTMLDListElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLDataElement\"><code>HTMLDataElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLDataListElement\"><code>HTMLDataListElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLDialogElement\"><code>HTMLDialogElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLDivElement\"><code>HTMLDivElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLDocument\"><code>HTMLDocument</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLElement\"><code>HTMLElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLEmbedElement\"><code>HTMLEmbedElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLFieldSetElement\"><code>HTMLFieldSetElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLFormControlsCollection\"><code>HTMLFormControlsCollection</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLFormElement\"><code>HTMLFormElement</code></a></li><li><a href=\"/en-US/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\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/HTMLHRElement\"><code>HTMLHRElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLHeadElement\"><code>HTMLHeadElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLHeadingElement\"><code>HTMLHeadingElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLHtmlElement\"><code>HTMLHtmlElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLIFrameElement\"><code>HTMLIFrameElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLImageElement\"><code>HTMLImageElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLInputElement\"><code>HTMLInputElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLLIElement\"><code>HTMLLIElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLLabelElement\"><code>HTMLLabelElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLLegendElement\"><code>HTMLLegendElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLLinkElement\"><code>HTMLLinkElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMapElement\"><code>HTMLMapElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMediaElement\"><code>HTMLMediaElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMenuElement\"><code>HTMLMenuElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMetaElement\"><code>HTMLMetaElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLMeterElement\"><code>HTMLMeterElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLModElement\"><code>HTMLModElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLOListElement\"><code>HTMLOListElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLObjectElement\"><code>HTMLObjectElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLOptGroupElement\"><code>HTMLOptGroupElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLOptionElement\"><code>HTMLOptionElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLOptionsCollection\"><code>HTMLOptionsCollection</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLOutputElement\"><code>HTMLOutputElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLParagraphElement\"><code>HTMLParagraphElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLPictureElement\"><code>HTMLPictureElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLPreElement\"><code>HTMLPreElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLProgressElement\"><code>HTMLProgressElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLQuoteElement\"><code>HTMLQuoteElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLScriptElement\"><code>HTMLScriptElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLSelectElement\"><code>HTMLSelectElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLSourceElement\"><code>HTMLSourceElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLSpanElement\"><code>HTMLSpanElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLStyleElement\"><code>HTMLStyleElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTableCaptionElement\"><code>HTMLTableCaptionElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTableCellElement\"><code>HTMLTableCellElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTableColElement\"><code>HTMLTableColElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTableElement\"><code>HTMLTableElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTableRowElement\"><code>HTMLTableRowElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTableSectionElement\"><code>HTMLTableSectionElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTemplateElement\"><code>HTMLTemplateElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTextAreaElement\"><code>HTMLTextAreaElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTimeElement\"><code>HTMLTimeElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTitleElement\"><code>HTMLTitleElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLTrackElement\"><code>HTMLTrackElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLUListElement\"><code>HTMLUListElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLUnknownElement\"><code>HTMLUnknownElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HTMLVideoElement\"><code>HTMLVideoElement</code></a></li><li><a href=\"/en-US/docs/Web/API/HashChangeEvent\"><code>HashChangeEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/History\"><code>History</code></a></li><li><a href=\"/en-US/docs/Web/API/ImageData\"><code>ImageData</code></a></li><li><a href=\"/en-US/docs/Web/API/Location\"><code>Location</code></a></li><li><a href=\"/en-US/docs/Web/API/MessageChannel\"><code>MessageChannel</code></a></li><li><a href=\"/en-US/docs/Web/API/MessageEvent\"><code>MessageEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/MessagePort\"><code>MessagePort</code></a></li><li><a href=\"/en-US/docs/Web/API/PageRevealEvent\"><code>PageRevealEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/PageSwapEvent\"><code>PageSwapEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/PageTransitionEvent\"><code>PageTransitionEvent</code></a></li><li><a href=\"/en-US/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\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/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\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/API/PromiseRejectionEvent\"><code>PromiseRejectionEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/RadioNodeList\"><code>RadioNodeList</code></a></li><li><a href=\"/en-US/docs/Web/API/UserActivation\"><code>UserActivation</code></a></li><li><a href=\"/en-US/docs/Web/API/ValidityState\"><code>ValidityState</code></a></li><li><a href=\"/en-US/docs/Web/API/Window\"><code>Window</code></a></li><li><a href=\"/en-US/docs/Web/API/WorkletGlobalScope\"><code>WorkletGlobalScope</code></a></li></ol></details></li></ol>","sidebarMacro":"APIRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<div class=\"notecard secure\"><p><strong>Secure context:</strong> This feature is available only in <a href=\"/en-US/docs/Web/Security/Secure_Contexts\">secure contexts</a> (HTTPS), in some or all <a href=\"#browser_compatibility\">supporting browsers</a>.</p></div>\n<p>The <strong><a href=\"/en-US/docs/Web/API/Navigator\"><code>Navigator</code></a></strong> method <strong><code>registerProtocolHandler()</code></strong> lets websites register their ability to open or handle particular URL schemes (also known as protocols).</p>\n<p>For example, this API lets webmail sites open <code>mailto:</code> URLs, or VoIP sites open <code>tel:</code> URLs.</p>\n<p>To register a protocol handler, a website calls <code>registerProtocolHandler()</code>, passing in the protocol to register and a template URL.</p>\n<p>When the user activates a link that uses the registered protocol, the browser will insert the <a href=\"/en-US/docs/Web/HTML/Element/a#href\"><code>href</code></a> from the activated link into the URL template supplied during handler registration, and navigate the current page to the resulting URL.</p>\n<p>The browser may ask the user to confirm that they want the page to be allowed to handle the protocol, either when the protocol is registered or when the user activates the link.</p>"}},{"type":"prose","value":{"id":"syntax","title":"Syntax","isH3":false,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>registerProtocolHandler(scheme, url)\n</code></pre></div>"}},{"type":"prose","value":{"id":"parameters","title":"Parameters","isH3":true,"content":"<dl>\n <dt id=\"scheme\"><a href=\"#scheme\"><code>scheme</code></a></dt>\n <dd>\n <p>A string containing the scheme for the protocol that the site wishes to handle.</p>\n <p>This may be a custom scheme, in which case the scheme's name:</p>\n <ul>\n <li>Begins with <code>web+</code></li>\n <li>Contains at least one letter after the <code>web+</code> prefix</li>\n <li>Contains only lowercase <a href=\"/en-US/docs/Glossary/ASCII\">ASCII</a> letters.</li>\n </ul>\n <p>Otherwise, the scheme must be one of the following:</p>\n <ul>\n <li><code>bitcoin</code></li>\n <li><code>ftp</code></li>\n <li><code>ftps</code></li>\n <li><code>geo</code></li>\n <li><code>im</code></li>\n <li><code>irc</code></li>\n <li><code>ircs</code></li>\n <li><code>magnet</code></li>\n <li><code>mailto</code></li>\n <li><code>matrix</code></li>\n <li><code>mms</code></li>\n <li><code>news</code></li>\n <li><code>nntp</code></li>\n <li><code>openpgp4fpr</code></li>\n <li><code>sftp</code></li>\n <li><code>sip</code></li>\n <li><code>sms</code></li>\n <li><code>smsto</code></li>\n <li><code>ssh</code></li>\n <li><code>tel</code></li>\n <li><code>urn</code></li>\n <li><code>webcal</code></li>\n <li><code>wtai</code></li>\n <li><code>xmpp</code></li>\n </ul>\u003c!-- This must match: https://html.spec.whatwg.org/multipage/system-state.html#safelisted-scheme -->\n </dd>\n <dt id=\"url\"><a href=\"#url\"><code>url</code></a></dt>\n <dd>\n <p>\n A string containing the URL of the handler.\n This URL must include <code>%s</code>, as a placeholder that will be replaced with the <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent\">escaped</a> URL to be handled.\n </p>\n <p>The handler URL must use the <code>https</code> scheme, and must be of the same <a href=\"/en-US/docs/Glossary/Origin\">origin</a> as the webpage that is attempting to register the handler.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"return_value","title":"Return value","isH3":true,"content":"<p>None (<a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/undefined\"><code>undefined</code></a>).</p>"}},{"type":"prose","value":{"id":"exceptions","title":"Exceptions","isH3":true,"content":"<dl>\n <dt id=\"securityerror\"><a href=\"#securityerror\"><code>SecurityError</code></a> <a href=\"/en-US/docs/Web/API/DOMException\"><code>DOMException</code></a></dt>\n <dd>\n <p>\n The user agent blocked the registration.\n This might happen if:\n </p>\n <ul>\n <li>The registered scheme (protocol) is invalid, such as a scheme the browser handles itself (<code>https:</code>, <code>about:</code>, etc.)</li>\n <li>The handler URL's <a href=\"/en-US/docs/Glossary/Origin\">origin</a> does not match the origin of the page calling this API.</li>\n <li>The handler's URL's scheme is not <code>https</code>.</li>\n </ul>\n </dd>\n <dt id=\"syntaxerror\"><a href=\"#syntaxerror\"><code>SyntaxError</code></a> <a href=\"/en-US/docs/Web/API/DOMException\"><code>DOMException</code></a></dt>\n <dd>\n <p>The <code>%s</code> placeholder is missing from the handler URL.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"examples","title":"Examples","isH3":false,"content":""}},{"type":"prose","value":{"id":"registering_a_handler_for_the_mailto_protocol","title":"Registering a handler for the mailto protocol","isH3":true,"content":"<p>It's fairly common for web pages to link to resources using non-<code>https</code> protocols. An example is the <code>mailto:</code> protocol. Web authors can use a <code>mailto</code> link when they want to provide a convenient way for users to send an email directly from the webpage:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">html</span></div><pre class=\"brush: html notranslate\"><code><a href=\"mailto:webmaster@example.com\">Web Master</a>\n</code></pre></div>\n<p>When the link is activated, the browser should launch the default desktop application for handling email. You can think of this as a <em>desktop-based</em> protocol handler.</p>\n<p>Web-based protocol handlers allow web-based applications to participate in the process too. An email web app at <code>mail.example.org</code> can register to handle <code>mailto</code> links with code like this:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>navigator.registerProtocolHandler(\"mailto\", \"https://mail.example.org/?to=%s\");\n</code></pre></div>\n<p>After this, when the user clicks a <code>mailto</code> link on any website, the browser will (after possibly asking the browser for confirmation) navigate to <code>https://mail.example.org/?to=mailto:webmaster@example.com</code>. This page could parse the URL parameter to extract the address, and use this to initialize an email.</p>"}},{"type":"prose","value":{"id":"registering_a_handler_for_a_custom_protocol","title":"Registering a handler for a custom protocol","isH3":true,"content":"<p>In this example, a page registers a handler for the <code>web+burger</code> protocol with code like this:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>navigator.registerProtocolHandler(\n \"web+burger\",\n \"https://burgers.example.org/?burger=%s\",\n);\n</code></pre></div>\n<p>Subsequently, the user visit a page containing a link like this:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">html</span></div><pre class=\"brush: html notranslate\"><code><a href=\"web+burger:cheeseburger\">cheeseburger</a>\n</code></pre></div>\n<p>If the user activates the <code>web+burger</code> link, the browser will (after possibly asking the user for confirmation) navigate to <code>https://burgers.example.org/?burger=web+burger:cheeseburger</code>.</p>"}},{"type":"specifications","value":{"title":"Specifications","id":"specifications","isH3":false,"specifications":[{"bcdSpecificationURL":"https://html.spec.whatwg.org/multipage/system-state.html#custom-handlers","title":"HTML Standard"}],"query":"api.Navigator.registerProtocolHandler"}},{"type":"browser_compatibility","value":{"title":"Browser compatibility","id":"browser_compatibility","isH3":false,"query":"api.Navigator.registerProtocolHandler"}}],"toc":[{"text":"Syntax","id":"syntax"},{"text":"Examples","id":"examples"},{"text":"Specifications","id":"specifications"},{"text":"Browser compatibility","id":"browser_compatibility"}],"summary":"The Navigator method registerProtocolHandler() lets websites register their ability to open or handle particular URL schemes (also known as protocols).","popularity":0.002,"modified":"2024-08-19T19:56:14.000Z","other_translations":[{"locale":"de","title":"Navigator: registerProtocolHandler() Methode","native":"Deutsch"},{"locale":"es","title":"window.navigator.registerProtocolHandler","native":"Español"},{"locale":"fr","title":"Navigator.registerProtocolHandler()","native":"Français"},{"locale":"ja","title":"Navigator: registerProtocolHandler() メソッド","native":"日本語"},{"locale":"ko","title":"Navigator.registerProtocolHandler()","native":"한국어"},{"locale":"ru","title":"Navigator.registerProtocolHandler()","native":"Русский"},{"locale":"zh-CN","title":"Navigator：registerProtocolHandler() 方法","native":"中文 (简体)"},{"locale":"zh-TW","title":"Navigator：registerProtocolHandler() 方法","native":"正體中文 (繁體)"}],"pageType":"web-api-instance-method","source":{"folder":"en-us/web/api/navigator/registerprotocolhandler","github_url":"https://github.com/mdn/content/blob/main/files/en-us/web/api/navigator/registerprotocolhandler/index.md","last_commit_url":"https://github.com/mdn/content/commit/f98675af9d0a80f33d7875c48cfdb41f71ed1de9","filename":"index.md"},"short_title":"registerProtocolHandler()","parents":[{"uri":"/en-US/docs/Web","title":"References"},{"uri":"/en-US/docs/Web/API","title":"Web APIs"},{"uri":"/en-US/docs/Web/API/Navigator","title":"Navigator"},{"uri":"/en-US/docs/Web/API/Navigator/registerProtocolHandler","title":"registerProtocolHandler()"}],"pageTitle":"Navigator: registerProtocolHandler() method - Web APIs | MDN","noIndexing":false}}</script></body></html>