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    <p>The <a href="https://www.w3.org/TR/custom-elements/" rel="noreferrer">Custom Elements specification</a> is available in Chrome and Opera, and becoming available in <a href="http://caniuse.com/#feat=custom-elements" rel="noreferrer">other browsers</a>. It provides a means to register custom elements in a formal manner.</p> <blockquote> <p>Custom elements are new types of DOM elements that can be defined by authors. Unlike <a href="http://www.w3.org/TR/2013/WD-components-intro-20130606/#decorator-section" rel="noreferrer">decorators</a>, which are stateless and ephemeral, custom elements can encapsulate state and provide script interfaces.</p> </blockquote> <p>Custom elements is a part of a larger W3 specification called <a href="https://www.w3.org/standards/techs/components" rel="noreferrer">Web Components</a>, along with Templates, HTML Imports, and Shadow DOM.</p> <blockquote> <p>Web Components enable Web application authors to define widgets with a level of visual richness and interactivity not possible with CSS alone, and ease of composition and reuse not possible with script libraries today.</p> </blockquote> <p>However, from this <a href="https://developers.google.com/web/fundamentals/primers/customelements/" rel="noreferrer">excellent walk through article</a> on Google Developers about Custom Elements v1:</p> <blockquote> <p>The name of a custom element must contain a dash (<code>-</code>). So <code>&lt;x-tags&gt;</code>, <code>&lt;my-element&gt;</code>, and <code>&lt;my-awesome-app&gt;</code> are all valid names, while <code>&lt;tabs&gt;</code> and <code>&lt;foo_bar&gt;</code> are not. This requirement is so the HTML parser can distinguish custom elements from regular elements. It also ensures forward compatibility when new tags are added to HTML.</p> </blockquote> <p><strong>Some Resources</strong></p> <ul> <li>A "gallery" of Web Components is being compiled at <a href="http://customelements.io/" rel="noreferrer">http://customelements.io/</a></li> <li><a href="http://webcomponents.org/polyfills/" rel="noreferrer">WebComponents.js</a> serves as a polyfill for Web Components until they are supported everywhere. See also the <a href="https://github.com/WebComponents/webcomponentsjs" rel="noreferrer">WebComponents.js github page &amp; web browser support table</a>.</li> </ul>
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    1. POAre custom elements valid HTML5?
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    1. USDan Dascalescu
    1. USjessegavin
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    1. POAre custom elements valid HTML5?
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    1. COThat's a good answer (+1) but the rule is somewhat circular. "Users must not do things that are not permitted ..."
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    2. CO@Alohci you should have added the next 3 words to your quote: "by this specification".
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      1. USjessegavin
    3. COI also read that part of the spec, and it really confused me. Here's why: 1) custom attributes are permitted in HTML5. This confirms Alochi's circular argument observation. 2) Nowhere does the spec say that custom elements are not permitted.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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