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'mainmenuopen' : '')" i-amphtml-binding> <div class="ap-o-header"> <a class="ap-o-header-home" href="/"> <svg class="ap-o-header-home-logo"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#logo"/></svg> <span class="ap-o-header-home-title">AMP</span> </a> <nav class="ap-o-header-main"> <div class="ap-o-header-main-item"> <button class="ap-o-header-main-link -tw "> About <div class="ap-a-ico ap-o-header-main-link-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> </button> <ul class="ap-o-header-flyout"> <li class="ap-o-header-flyout-primary-item"> <a class="ap-o-header-flyout-primary-item-link websites" href="/about/websites/"> <div class="ap-o-header-flyout-primary-item-link-icon websites"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#amp-websites"/></svg> </div> <div class="ap-o-header-flyout-primary-item-link-info ap-o-header-flyout-primary-item-link-info-websites"> <div 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exit:slideTransition.start,slideTransition.reverse" intersection-ratios="1" layout="nodisplay" class="i-amphtml-layout-nodisplay" hidden="hidden" i-amphtml-layout="nodisplay"> </amp-position-observer> <amp-animation id="slideTransition" layout="nodisplay" class="i-amphtml-layout-nodisplay" hidden="hidden" i-amphtml-layout="nodisplay"> <script type="application/json">{"duration":"150ms","fill":"both","easing":"ease-out","iterations":"1","animations":[{"selector":".label-title","keyframes":[{"transform":"scale3d(0, 1, 1)"},{"transform":"scale3d(1, 1, 1)"}]}]}</script> </amp-animation> </div> <amp-user-notification class="-fv i-amphtml-layout-nodisplay" id="format-filter-hint" layout="nodisplay" hidden="hidden" i-amphtml-layout="nodisplay"> </amp-user-notification> <div class="-fd" aria-hidden="true"> <div class="-fm"> <div class="-fg">Select your format for a more streamlined experience</div> <button class="-fy" on="tap:format-filter-hint.dismiss"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#close"/></svg> </button> </div> </div> <main class="ap--main -ao"> <div class="-tf"> <input class="-od ap-a-sidebar-mobile-toggle-input-sidebar" type="checkbox" name="sidebar" id="sidebar" autocomplete="off"> <input class="-om ap-a-sidebar-desktop-toggle-input-sidebar" type="checkbox" name="sidebar-desktop" id="sidebar-desktop" autocomplete="off"> <span id="ap--sidebar-content" class="-oy"></span> <section class="ap--toc"> <div class="ap-o-toc" [class]="contentmenuopen ? 'ap-o-toc contentmenuopen' : 'ap-o-toc'" i-amphtml-binding> <label class="ap-o-toc-toggle" for="toc" on="tap:AMP.setState({contentmenuopen: !contentmenuopen})" role="contentmenutrigger" tabindex="0"> <span class="ap-o-toc-hl">Table of contents</span> <span class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> </label> <input class="-oh -of" type="checkbox" name="toc" id="toc" autocomplete="off"> <ul><li><a href="#overview">Overview </a></li> <li><a href="#behavior">Behavior </a></li> <li><a href="#layout-attributes">Layout Attributes </a><ul> <li><a href="#width-and-height">width and height </a></li> <li><a href="#layout">layout </a></li> <li><a href="#sizes">sizes </a></li> <li><a href="#disable-inline-width">disable-inline-width </a></li> <li><a href="#heights">heights </a></li> <li><a href="#media">media </a></li> <li><a href="#placeholder">placeholder </a></li> <li><a href="#fallback">fallback </a></li> <li><a href="#noloading">noloading </a></li> </ul> </li> <li><a href="#(tl;dr)-summary-of-layout-requirements-&-behaviors">(tl;dr) Summary of Layout Requirements & Behaviors </a></li></ul> </div> </section> <section class="-t"> <label class="-op -ol ap-a-sidebar-mobile-toggle-label-sidebar" for="sidebar" on="tap:sidebar-left.toggle" role="categoriemenutrigger" tabindex="0"> <span class="label-icon"><svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sidebar-toggle"/></svg></span> <span class="label-title">Toggle Sidebar</span> </label> <label class="-op -og ap-a-sidebar-desktop-toggle-label-sidebar" for="sidebar-desktop" role="categoriemenutrigger-desktop" tabindex="0"> <span class="label-icon"><svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sidebar-toggle"/></svg></span> <span class="label-title">Toggle Sidebar</span> </label> <nav class="-ou"> <a class="ap-m-breadcrumbs-crumb" href="/documentation/">Documentation</a> <span class="ap-m-breadcrumbs-divider"> <svg class="ap-a-ico -oa"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <a class="ap-m-breadcrumbs-crumb" href="/documentation/guides-and-tutorials/">Guides & Tutorials</a> <span class="ap-m-breadcrumbs-divider"> <svg class="ap-a-ico -oa"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <div class="ap-m-breadcrumbs-crumb">AMP's Layout System</div> </nav> <h1>AMPHTML Layout System</h1> <h2 id="overview">Overview <a name="overview"></a></h2> <p>The main goal of the layout system is to ensure that AMP elements can express their layout so that the runtime is able to infer sizing of elements before any remote resources, such as JavaScript and data calls, have been completed. This is important since this significantly reduces rendering and scrolling jank.</p> <p>With this in mind, the AMP Layout System is designed to support few but flexible layouts that provide good performance guarantees. This system relies on a set of attributes such as <code>layout</code>, <code>width</code>, <code>height</code>, <code>sizes</code> and <code>heights</code> to express the element's layout and sizing needs.</p> <h2 id="behavior">Behavior <a name="behavior"></a></h2> <p>A non-container AMP element (i.e., <code>layout != container</code>) starts up in the unresolved/unbuilt mode in which all of its children are hidden except for a placeholder (see <code>placeholder</code> attribute). The JavaScript and data payload necessary to fully construct the element may still be downloading and initializing, but the AMP runtime already knows how to size and lay out the element only relying on CSS classes and <code>layout</code>, <code>width</code>, <code>height</code> and <code>media</code> attributes. In most cases, a <code>placeholder</code>, if specified, is sized and positioned to take all of the element's space.</p> <p>The <code>placeholder</code> is hidden as soon as the element is built and its first layout complete. At this point, the element is expected to have all of its children properly built and positioned and ready to be displayed and to accept a reader's input. This is the default behavior. Each element can override to, e.g., hide <code>placeholder</code> faster or keep it around longer.</p> <p>The element is sized and displayed based on the <code>layout</code>, <code>width</code>, <code>height</code> and <code>media</code> attributes by the runtime. All of the layout rules are implemented via CSS internally. The element is said to "define size" if its size is inferable via CSS styles and does not change based on its children: available immediately or inserted dynamically. This does not mean that this element's size cannot change. The layout could be fully responsive as is the case with <code>responsive</code>, <code>fixed-height</code>, <code>fill</code> and <code>flex-item</code> layouts. It simply means that the size does not change without an explicit user action, e.g. during rendering or scrolling or post download.</p> <p>If the element has been configured incorrectly, in PROD it will not be rendered at all and in DEV mode the runtime will render the element in the error state. Possible errors include invalid or unsupported values of <code>layout</code>, <code>width</code> and <code>height</code> attributes.</p> <h2 id="layout-attributes">Layout Attributes <a name="layout-attributes"></a></h2> <h3 id="width-and-height"><code>width</code> and <code>height</code> <a name="width-and-height"></a></h3> <p>Depending on the value of the <code>layout</code> attribute, AMP component elements must have a <code>width</code> and <code>height</code> attribute that contains an integer pixel value. Actual layout behavior is determined by the <code>layout</code> attribute as described below.</p> <p>In a few cases, if <code>width</code> or <code>height</code> are not specified, the AMP runtime can default these values as follows:</p> <ul> <li><code>amp-pixel</code>: Both <code>width</code> and <code>height</code> are defaulted to 0.</li> <li><code>amp-audio</code>: The default <code>width</code> and <code>height</code> are inferred from browser.</li> </ul> <h3 id="layout"><code>layout</code> <a name="layout"></a></h3> <p>AMP provides a set of layouts that specify how an AMP component behaves in the document layout. You can specify a layout for a component by adding the <code>layout</code> attribute with one of the values specified in the table below.</p> <p><strong>Example</strong>: A simple responsive image, where width and height are used to determine the aspect ratio.</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-img</span> <span class="na">src</span><span class="o">=</span><span class="s">"/img/amp.jpg"</span> <span class="na">width</span><span class="o">=</span><span class="s">"1080"</span> <span class="na">height</span><span class="o">=</span><span class="s">"610"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span> <span class="na">alt</span><span class="o">=</span><span class="s">"an image"</span> <span class="p">></</span><span class="nt">amp-img</span><span class="p">></span> </pre></div> <p>Supported values for the <code>layout</code> attribute:</p> <table> <thead> <tr> <th width="30%">Value</th> <th>Behavior and Requirements</th> </tr> </thead> <tbody> <tr> <td>Not present</td> <td>If no value is specified, the layout for the component is inferred as follows: <ul> <li>If <code>height</code> is present and <code>width</code> is absent or is set to <code>auto</code>, a <code>fixed-height</code> layout is assumed.</li> <li>If <code>width</code> and <code>height</code> are present along with a <code>sizes</code> or <code>heights</code> attribute, a <code>responsive</code> layout is assumed.</li> <li>If <code>width</code> and <code>height</code> are present, a <code>fixed</code> layout is assumed.</li> <li> if <code>width</code> and <code>height</code> are absent, a <code>container</code> layout is assumed.</li> </ul> </td> </tr> <tr> <td><code>container</code></td> <td>The element lets its children define its size, much like a normal HTML <code>div</code>. The component is assumed to not have specific layout itself but only act as a container; its children are rendered immediately.</td> </tr> <tr> <td><code>fill</code></td> <td>The element takes the space available to it—both width and height. In other words, the layout and size of a <code>fill</code> element matches its parent. For an element to fill its parent container, specify the "fill" layout, and ensure the parent container specifies <code>position:relative</code> or <code>position:absolute</code>. </td> </tr> <tr> <td><code>fixed</code></td> <td>The element has a fixed width and height with no responsiveness supported. The <code>width</code> and <code>height</code> attributes must be present. The only exceptions are the <code>amp-pixel</code> and <code>amp-audio</code> components. </td> </tr> <tr> <td><code>fixed-height</code></td> <td>The element takes the space available to it but keeps the height unchanged. This layout works well for elements such as <code>amp-carousel</code> that involves content positioned horizontally. The <code>height</code> attribute must be present. The <code>width</code> attribute must not be present or must be equal to <code>auto</code>. </td> </tr> <tr> <td><code>flex-item</code></td> <td>The element and other elements in its parent with layout type <code>flex-item</code> take the parent container's remaining space when the parent is a flexible container (i.e., <code>display: flex</code>). The <code>width</code> and <code>height</code> attributes are not required.</td> </tr> <tr> <td><code>intrinsic</code></td> <td>The element takes the space available to it and resizes its height automatically to the aspect ratio given by the <code>width</code> and <code>height</code> attributes <em>until</em> it reaches the element's size defined by the `width` and `height` attributes passed to the <code>amp-img</code>, or reaches a CSS constraint, such as `max-width`. The width and height attributes must be present. This layout works very well for most AMP elements, including <code>amp-img</code>, <code>amp-carousel</code>, etc. The available space depends on the parent element and can also be customized using <code>max-width</code> CSS. This layout differs from <code>responsive</code> by having an intrinsic height and width. This is most apparent inside a floated element where a <code>responsive</code> layout will render 0x0 and an <code>intrinsic</code> layout will inflate to the smaller of its natural size or any CSS constraint.</td> </tr> <tr> <td><code>nodisplay</code></td> <td>The element isn't displayed, and takes up zero space on the screen as if its display style was <code>none</code>. This layout can be applied to every AMP element. It’s assumed that the element can display itself on user action (e.g., <code>amp-lightbox</code>). The <code>width</code> and <code>height</code> attributes are not required.</td> </tr> <tr> <td><code>responsive</code></td> <td>The element takes the space available to it and resizes its height automatically to the aspect ratio given by the <code>width</code> and <code>height</code> attributes. This layout works very well for most AMP elements, including <code>amp-img</code>, <code>amp-video</code>, etc. The available space depends on the parent element and can also be customized using <code>max-width</code> CSS. The <code>width</code> and <code>height</code> attributes must be present.<p><strong>Note</strong>: Elements with <code>"layout=responsive"</code> have no intrinsic size. The size of the element is determined from its container element. To ensure your AMP element displays, you must specify a width and height for the containing element. Do not specify <code>"display:table"</code> on the containing element as this overrides the display of the AMP element, rendering the AMP element invisible.</p></td> </tr> </tbody> </table> <h3 id="sizes"><code>sizes</code> <a name="sizes"></a></h3> <p>All AMP elements that support the <code>responsive</code> layout, also support the <code>sizes</code> attribute. The value of this attribute is a sizes expression as described in the <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img">img sizes</a>, but extended to all elements, not just images. In short, the <code>sizes</code> attribute describes how the width of the element is calculated depending on the media conditions.</p> <p>When the <code>sizes</code> attribute is specified along with <code>width</code> and <code>height</code>, the <code>layout</code> is defaulted to <code>responsive</code>.</p> <p><strong>Example</strong>: Using the <code>sizes</code> attribute</p> <p>In the following example, if the viewport is wider than <code>320px</code>, the image will be 320px wide, otherwise, it will be 100vw wide (100% of the viewport width).</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-img</span> <span class="na">src</span><span class="o">=</span><span class="s">"https://acme.org/image1.png"</span> <span class="na">width</span><span class="o">=</span><span class="s">"400"</span> <span class="na">height</span><span class="o">=</span><span class="s">"300"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span> <span class="na">sizes</span><span class="o">=</span><span class="s">"(min-width: 320px) 320px, 100vw"</span> <span class="p">></span> <span class="p"></</span><span class="nt">amp-img</span><span class="p">></span> </pre></div> <h3 id="disable-inline-width"><code>disable-inline-width</code> <a name="disable-inline-width"></a></h3> <p>The <code>sizes</code> attribute on its own will set an inline <code>width</code> style on the element. When pairing <code>disable-inline-width</code> with <code>sizes</code>, the AMP element will propagate the value of <code>sizes</code> to the element's underlying tag, as with the <code>img</code> nested inside an <code>amp-img</code>, <strong>without</strong> setting the inline <code>width</code> as <code>sizes</code> typically does on its own in AMP.</p> <p><strong>Example</strong>: Using the <code>disable-inline-width</code> attribute</p> <p>In the following example, the width of the <code><amp-img></code> element is unaffected, and <code>sizes</code> is only used to select one of the sources from the <code>srcset</code>.</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-img</span> <span class="na">src</span><span class="o">=</span><span class="s">"https://acme.org/image1.png"</span> <span class="na">width</span><span class="o">=</span><span class="s">"400"</span> <span class="na">height</span><span class="o">=</span><span class="s">"300"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span> <span class="na">sizes</span><span class="o">=</span><span class="s">"(min-width: 320px) 320px, 100vw"</span> <span class="na">disable-inline-width</span> <span class="p">></span> <span class="p"></</span><span class="nt">amp-img</span><span class="p">></span> </pre></div> <h3 id="heights"><code>heights</code> <a name="heights"></a></h3> <p>All AMP elements that support the <code>responsive</code> layout, also support the <code>heights</code> attribute. The value of this attribute is a sizes expression based on media expressions as similar to the <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img">img sizes attribute</a>, but with two key differences:</p> <ol> <li>It applies to the height, not the width of the element.</li> <li>Percent values are allowed, e.g. <code>86%</code>. If a percent value is used, it indicates the percentage of the element's width.</li> </ol> <p>When the <code>heights</code> attribute is specified along with <code>width</code> and <code>height</code>, the <code>layout</code> is defaulted to <code>responsive</code>.</p> <p><strong>Example</strong>: Using the <code>heights</code> attribute</p> <p>In the following example, the height of the image will default to 80% of the width, but if the viewport is wider than <code>500px</code>, the height is capped at <code>200px</code>. Because the <code>heights</code> attribute is specified along with <code>width</code> and <code>height</code>, the layout defaults to <code>responsive</code>.</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-img</span> <span class="na">src</span><span class="o">=</span><span class="s">"https://acme.org/image1.png"</span> <span class="na">width</span><span class="o">=</span><span class="s">"320"</span> <span class="na">height</span><span class="o">=</span><span class="s">"256"</span> <span class="na">heights</span><span class="o">=</span><span class="s">"(min-width:500px) 200px, 80%"</span> <span class="p">></span> <span class="p"></</span><span class="nt">amp-img</span><span class="p">></span> </pre></div> <h3 id="media"><code>media</code> <a name="media"></a></h3> <p>Most AMP elements support the <code>media</code> attribute. The value of <code>media</code> is a media query. If the query does not match, the element is not rendered at all and its resources and potentially its child resources will not be fetched. If the browser window changes size or orientation, the media queries are re-evaluated and elements are hidden and shown based on the new results.</p> <p><strong>Example</strong>: Using the <code>media</code> attribute</p> <p>In the following example, we have 2 images with mutually exclusive media queries. Depending on the screen width, one of the two images will be fetched and rendered. The <code>media</code> attribute is available on all AMP elements, so it can be used with non-image elements, such as ads.</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-img</span> <span class="na">media</span><span class="o">=</span><span class="s">"(min-width: 650px)"</span> <span class="na">src</span><span class="o">=</span><span class="s">"wide.jpg"</span> <span class="na">width</span><span class="o">=</span><span class="s">"466"</span> <span class="na">height</span><span class="o">=</span><span class="s">"355"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span> <span class="p">></</span><span class="nt">amp-img</span><span class="p">></span> <span class="p"><</span><span class="nt">amp-img</span> <span class="na">media</span><span class="o">=</span><span class="s">"(max-width: 649px)"</span> <span class="na">src</span><span class="o">=</span><span class="s">"narrow.jpg"</span> <span class="na">width</span><span class="o">=</span><span class="s">"527"</span> <span class="na">height</span><span class="o">=</span><span class="s">"193"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span> <span class="p">></</span><span class="nt">amp-img</span><span class="p">></span> </pre></div> <h3 id="placeholder"><code>placeholder</code> <a name="placeholder"></a></h3> <p>The <code>placeholder</code> attribute can be set on any HTML element, not just AMP elements. The <code>placeholder</code> attribute indicates that the element marked with this attribute acts as a placeholder for the parent AMP element. If specified, a placeholder element must be a direct child of the AMP element. By default, the placeholder is immediately shown for the AMP element, even if the AMP element's resources have not been downloaded or initialized. Once ready, the AMP element typically hides its placeholder and shows the content. The exact behavior with respect to the placeholder is up to the element's implementation.</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-anim</span> <span class="na">src</span><span class="o">=</span><span class="s">"animated.gif"</span> <span class="na">width</span><span class="o">=</span><span class="s">"466"</span> <span class="na">height</span><span class="o">=</span><span class="s">"355"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span><span class="p">></span> <span class="p"><</span><span class="nt">amp-img</span> <span class="na">placeholder</span> <span class="na">src</span><span class="o">=</span><span class="s">"preview.png"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"fill"</span><span class="p">></</span><span class="nt">amp-img</span><span class="p">></span> <span class="p"></</span><span class="nt">amp-anim</span><span class="p">></span> </pre></div> <h3 id="fallback"><code>fallback</code> <a name="fallback"></a></h3> <p>The <code>fallback</code> attribute can be set on any HTML element, not just AMP elements. A fallback is a convention that allows the element to communicate to the reader that the browser does not support the element. If specified, a fallback element must be a direct child of the AMP element. The exact behavior with respect to the fallback is up to the element's implementation.</p> <div class="-ta"><pre><span></span><span class="p"><</span><span class="nt">amp-anim</span> <span class="na">src</span><span class="o">=</span><span class="s">"animated.gif"</span> <span class="na">width</span><span class="o">=</span><span class="s">"466"</span> <span class="na">height</span><span class="o">=</span><span class="s">"355"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span><span class="p">></span> <span class="p"><</span><span class="nt">div</span> <span class="na">fallback</span><span class="p">></span>Cannot play animated images on this device.<span class="p"></</span><span class="nt">div</span><span class="p">></span> <span class="p"></</span><span class="nt">amp-anim</span><span class="p">></span> </pre></div> <h3 id="noloading"><code>noloading</code> <a name="noloading"></a></h3> <p>The <code>noloading</code> attribute indicates whether the "loading indicator" should be turned off for this element. Many AMP elements are allow-listed to show a "loading indicator", which is a basic animation that shows that the element has not yet fully loaded. The elements can opt out of this behavior by adding this attribute.</p> <h2 id="(tl;dr)-summary-of-layout-requirements-&-behaviors">(tl;dr) Summary of Layout Requirements & Behaviors <a name="tldr-summary-of-layout-requirements--behaviors"></a></h2> <p>The following table describes the acceptable parameters, CSS classes, and styles used for the <code>layout</code> attribute. Note that:</p> <ol> <li>Any CSS class marked prefixed with <code>-amp-</code> and elements prefixed with <code>i-amp-</code> are considered to be internal to AMP and their use in user stylesheets is not allowed. They are shown here simply for informational purposes.</li> <li>Even though <code>width</code> and <code>height</code> are specified in the table as required, the default rules may apply as is the case with <code>amp-pixel</code> and <code>amp-audio</code>.</li> </ol> <table> <thead> <tr> <th width="21%">Layout</th> <th width="20%">Width/<br>Height Required?</th> <th width="20%">Defines Size?</th> <th width="20%">Additional Elements</th> <th width="19%">CSS "display"</th> </tr> </thead> <tbody> <tr> <td><code>container</code></td> <td>No</td> <td>No</td> <td>No</td> <td><code>block</code></td> </tr> <tr> <td><code>fill</code></td> <td>No</td> <td>Yes, parent's size.</td> <td>No</td> <td><code>block</code></td> </tr> <tr> <td><code>fixed</code></td> <td>Yes</td> <td>Yes, specified by <code>width</code> and <code>height</code>.</td> <td>No</td> <td><code>inline-block</code></td> </tr> <tr> <td><code>fixed-height</code></td> <td><code>height</code> only; <code>width</code> can be <code>auto</code></td> <td>Yes, specified by the parent container and <code>height</code>.</td> <td>No</td> <td><code>block</code></td> </tr> <tr> <td><code>flex-item</code></td> <td>No</td> <td>No</td> <td>Yes, based on parent container.</td> <td><code>block</code></td> </tr> <tr> <td><code>intrinsic</code></td> <td>Yes</td> <td>Yes, based on parent container and aspect ratio of <code>width:height</code>.</td> <td>Yes, <code>i-amphtml-sizer</code>.</td> <td><code>block</code> (behaves like a <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Replaced_element" rel="nofollow">replaced element</a>)</td> </tr> <tr> <td><code>nodisplay</code></td> <td>No</td> <td>No</td> <td>No</td> <td><code>none</code></td> </tr> <tr> <td><code>responsive</code></td> <td>Yes</td> <td>Yes, based on parent container and aspect ratio of <code>width:height</code>.</td> <td>Yes, <code>i-amphtml-sizer</code>.</td> <td><code>block</code></td> </tr> </tbody> </table> </section> </div> </main> <amp-sidebar 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class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/converting/resolving-errors/"> Resolving validation errors </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/converting/discoverable/"> Making your page discoverable </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/converting/congratulations/"> Congratulations! </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/"> <span>Add advanced AMP</span> <span class="nav-link-lastword">features<svg class="ap-a-ico nav-type-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#tutorial"/></svg></span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/setting_up/"> Setting up </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/review_code/"> Reviewing the starter code </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/adding_components/"> Adding extended AMP components </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/adding_carousels/"> Adding carousels </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/tracking_data/"> Tracking engagement with analytics </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/navigating/"> Navigating your site </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/fonts/"> Adding fonts </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/start/add_advanced/congratulations/"> Congratulations! </a> </li> </ul> </li> </ul> </li> <li class="nav-item active level-1"> <span class="nav-link"> <span>Learn</span> </span> <input class="nav-trigger" type="checkbox" checked> <div class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> <ul class="nav-list level-2"> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/amp-actions-and-events/"> Actions and events </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/common_attributes/"> Common element attributes </a> </li> <li class="nav-item level-2"> <span class="nav-link"> <span>AMP HTML Specification</span> </span> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/spec/amp-boilerplate/"> AMP Boilerplate Code </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/spec/amp-html-responsive-attributes/"> AMP HTML Responsive Attributes </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/spec/amp-video-interface/"> Video in AMP </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/spec/amphtml/"> AMP HTML Specification </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/spec/release-schedule/"> AMP Release Schedule </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/experimental/"> Enable experimental features </a> </li> <li class="nav-item active level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/amp-html-layout/"> <span>AMP's Layout System</span> </a> <input class="nav-trigger" type="checkbox" checked> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item active level-3" autoscroll> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/amp-html-layout/"> AMPHTML Layout System </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/amp-html-layout/layouts_demonstrated/"> Demonstrating AMP layouts </a> </li> </ul> </li> <li class="nav-item level-2"> <span class="nav-link"> <span>Validation Workflow</span> </span> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/validation-workflow/validate_amp/"> Validate AMP pages </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/validation-workflow/validation_errors/"> AMP validation errors </a> </li> </ul> </li> <li class="nav-item level-2"> <span class="nav-link"> <span>AMP Caches & CORS</span> </span> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/amp-caches-and-cors/amp-cache-debugging/"> Debug AMP Cache issues </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/amp-caches-and-cors/amp-cors-requests/"> CORS in AMP </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/amp-caches-and-cors/how_amp_pages_are_cached/"> How AMP pages are cached </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/amp-caches-and-cors/amp-cache-urls/"> AMP Cache URL Format and Request Handling </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/learn/combine-amp-pwa/"> How AMP and PWA relate to each other </a> </li> </ul> </li> <li class="nav-item level-1"> <span class="nav-link"> <span>Develop</span> </span> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> <ul class="nav-list level-2"> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/style_and_layout/"> <span>Style & Layout</span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/style_and_layout/style_pages/"> Supported CSS </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/style_and_layout/control_layout/"> Layout & media queries </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/style_and_layout/placeholders/"> Placeholders & fallbacks </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/style_and_layout/art_direction/"> Responsive images with srcset, sizes & heights </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/style_and_layout/responsive_design/"> Create responsive AMP pages </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/style_and_layout/custom_fonts/"> Add custom fonts </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/media_iframes_3p/"> <span>Include media, iframes & third-party content</span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/media_iframes_3p/"> Include images & video </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/media_iframes_3p/third_party_components/"> Include third-party content </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/media_iframes_3p/iframes/"> Include iframes </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity_guide/"> <span>Interactivity</span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity_guide/foundations/"> Interactivity foundations </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity_guide/ready_made/"> Ready-made interactivity with AMP components </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity_guide/personalized_experiences/"> Building personalized interactive experiences </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity_guide/client_rendering/"> Client-side rendering in AMP </a> </li> </ul> </li> <li class="nav-item level-2"> <span class="nav-link"> <span>Animate & Transition</span> </span> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/animations/triggering_css_animations/"> Triggering CSS animations & transitions </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/animations/introduction_to_animations/"> Introduction to complex animations </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/custom-javascript/"> Use custom JavaScript in AMP pages </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/monetization/"> <span>Monetize your AMP pages</span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/monetization/"> Monetizing your AMP page with ads </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/monetization/ads_vendors/"> Ads vendors </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/monetization/content_encryption/"> Protect your subscription content with client-side encryption </a> </li> </ul> </li> <li class="nav-item-tutorial-divider"></li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity/"> <span>Create interactive AMP</span> <span class="nav-link-lastword">pages<svg class="ap-a-ico nav-type-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#tutorial"/></svg></span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity/prereqs-setup/"> Setting up </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity/get-familiar/"> Getting familiar with the starter code </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity/advanced-interactivity/"> Improving the interactivity </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity/remote-data/"> Working with remote data </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/interactivity/wrapping-up/"> Wrapping up </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/login_requiring/"> <span>Create a login-requiring AMP</span> <span class="nav-link-lastword">page<svg class="ap-a-ico nav-type-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#tutorial"/></svg></span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/login_requiring/login/"> Login </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/login_requiring/add_comment/"> Add a comment </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/login_requiring/logout/"> Logout </a> </li> <li class="nav-item level-3"> <div class="ap-m-tutorial-progress "></div> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/login_requiring/summary/"> Summary </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/custom-javascript-tutorial/"> Create a UI widget with custom JavaScript <svg class="ap-a-ico nav-type-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#tutorial"/></svg> </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/live_blog/"> Create a live blog <svg class="ap-a-ico nav-type-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#tutorial"/></svg> </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/seatmap/"> Create a seatmap <svg class="ap-a-ico nav-type-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#tutorial"/></svg> </a> </li> </ul> </li> <li class="nav-item level-1"> <span class="nav-link"> <span>Integrate</span> </span> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> <ul class="nav-list level-2"> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/integrate/web-story-player-guide/"> Creating Web Story experiences using the Web Story Player on non-AMP sites </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/integrate/amp-in-pwa/"> Use AMP as a data source for your PWA </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/integrate/amp-to-pwa/"> Preload your PWA from your AMP pages </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/integrate/integrate-with-apps/"> Integrate AMP with your app </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/integrate/embed-stories/"> Integrate stories in AMP pages </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/integrate/embed-stories-nonamp/"> Integrate Web Stories in non-AMP pages </a> </li> </ul> </li> <li class="nav-item level-1"> <span class="nav-link"> <span>Optimize & Measure</span> </span> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </div> <ul class="nav-list level-2"> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/amp-managing-user-state/"> Manage non-authenticated user state with AMP </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/publishing_checklist/"> AMP publishing checklist </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/amp-optimizer-guide/"> <span>Using an AMP Optimizer</span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/amp-optimizer-guide/explainer/"> How an AMP Optimizer works </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/amp-optimizer-guide/node-amp-optimizer/"> Node.js AMP Optimizer Guide </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/configure-analytics/"> <span>Track engagement with analytics</span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/configure-analytics/analytics-vendors/"> Analytics Vendors </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/configure-analytics/analytics_basics/"> Analytics: the basics </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/configure-analytics/deep_dive_analytics/"> Deep dive into AMP analytics </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/configure-analytics/use_cases/"> Use cases </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/optimize-and-measure/signed-exchange/"> Serve AMP using signed exchanges </a> </li> <li class="nav-item level-2"> <a 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