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POWhat is the difference between the hidden attribute (HTML5) and the display:none rule (CSS)?
 

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  1. POWhat is the difference between the hidden attribute (HTML5) and the display:none rule (CSS)?
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    <p>HTML5 has a new global attribute, <code>hidden</code>, which can be used to hide content. </p> <pre class="lang-html prettyprint-override"><code>&lt;article hidden&gt; &lt;h2&gt;Article #1&lt;/h2&gt; &lt;p&gt;Lorem ipsum ...&lt;/p&gt; &lt;/article&gt; </code></pre> <p>CSS has the <code>display:none</code> rule, which can also be used to hide content. </p> <pre><code>article { display:none; } </code></pre> <p>Visually, they are identical. What is the difference semantically? Computationally?</p> <p>What guidelines should I consider on when to use one or the other?</p> <p>TIA.</p> <p><strong>EDIT</strong>: Based on @newtron's responses (below), I did more searching. The <code>hidden</code> attribute was hotly contested last year and (apparently) barely made it into the HTML5 spec. Some argued it was redundant and had no purpose. From what I can tell, the final evaluation is this: If I'm targeting only web browsers, there is no difference. (One page even asserted that web browsers used <code>display:none</code> to implement the hidden attribute.) But if I'm considering accessibility (e.g., perhaps I expect my content to be read by screen-readers), then there is a difference. The CSS rule <code>display:none</code> might hide my content from web browsers, but a corresponding aria rule (e.g., <code>aria-hidden="false"</code>) might try to read it. Thus, I now agree that @newtron's answer is correct, though perhaps (arguably) not as clear as I might like. Thanks @newtron for your help.</p>
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    1. CODidn't even know the `hidden` attribute exists, but certainly a good question as having it seems to violate the structure / presentation separation.
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    2. COFor those who haven't yet had the joy of reading the HTML5 spec on this attribute: http://www.w3.org/TR/html5/editing.html#the-hidden-attribute
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    3. COhttp://www.w3.org/html/wg/wiki/ChangeProposals/removehidden
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