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<base href="https://bugs.webkit.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - matchMedia late by 1px compared to CSS media query"
href="https://bugs.webkit.org/show_bug.cgi?id=158422">158422</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>matchMedia late by 1px compared to CSS media query
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>Safari 9
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>OS</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>Normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P2
</td>
</tr>
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<th>Component</th>
<td>WebCore JavaScript
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yeldinov@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>@media (min-width: 720px) and (max-width: 989px) {
#css {
background-color: orange;
}
}
window.matchMedia('(min-width: 720px) and (max-width: 989px)').addListener( ... );
At 720px background color will become orange, and only at 721px MediaQueryList will fire an event notifying that breakpoint changed</pre>
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