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POWhy does IE10 require the presence of a p:hover {} rule for transitions to work on a pseudo element?
 

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  1. POWhy does IE10 require the presence of a p:hover {} rule for transitions to work on a pseudo element?
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    <p>HTML:</p> <pre><code>&lt;p&gt;Hover&lt;/p&gt; </code></pre> <p>CSS:</p> <pre class="lang-css prettyprint-override"><code>p::after { content: " here"; transition: all 1s; } p:hover::after { font-size: 200%; color: red; } </code></pre> <p><strong>Live demo:</strong> <a href="http://jsfiddle.net/SPHzj/13/" rel="nofollow">http://jsfiddle.net/SPHzj/13/</a> (works in Firefox and Chrome)</p> <p>As you can see, I've set up CSS transitions on the <code>::after</code> pseudo-element of the paragraph. Then, when the paragraph is hovered, two new styles apply for the pseudo-element which are transitioned.</p> <p>This works in Firefox and Chrome, but not in IE10. My reasoning was that IE doesn't understand the <code>p:hover::after</code> selector, as it works in IE if you set the hover on an ancestor element, e.g. <code>div:hover p::after</code> - live demo: <a href="http://jsfiddle.net/SPHzj/14/" rel="nofollow">http://jsfiddle.net/SPHzj/14/</a>.</p> <p>However, this is not the case, as IE is indeed able to understand that selector. The trick is to define a <code>p:hover {}</code> rule as well. (Discovered by <a href="https://twitter.com/maxw3st/status/323262053823434752" rel="nofollow">@maxw3st</a>.) </p> <pre class="lang-css prettyprint-override"><code>p:hover {} </code></pre> <p>This rule can be empty. The mere presence of this rule will make the transitioning work in IE10. </p> <p><strong>Live demo:</strong> <a href="http://jsfiddle.net/SPHzj/15/" rel="nofollow">http://jsfiddle.net/SPHzj/15/</a> (also works in IE10)</p> <p>What's going on here? Why does IE require that rule to be present in order for transitions to work on the pseudo-element? Should this be considered a bug?</p>
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