<html>
<head>
<base href="https://bugs.webkit.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - MutationObserver doesn't add a record when classList.add/remove is a no-op"
href="https://bugs.webkit.org/show_bug.cgi?id=148780">148780</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>MutationObserver doesn't add a record when classList.add/remove is a no-op
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>WebKit Nightly Build
</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>
<tr>
<th>Component</th>
<td>HTML DOM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rniwa@webkit.org
</td>
</tr>
<tr>
<th>CC</th>
<td>benjamin@webkit.org, cdumez@apple.com, sam@webkit.org, webkit-bug-importer@group.apple.com
</td>
</tr></table>
<p>
<div>
<pre>MutationObserver should be getting new records on classList.add/remove even if they're no-op.
See <a href="https://dom.spec.whatwg.org/#concept-DTL-update">https://dom.spec.whatwg.org/#concept-DTL-update</a>
Firefox adds the records as expected by the spec.
This bug was found by the newly added test: LayoutTests/http/tests/w3c/dom/nodes/MutationObserver-attributes.html</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>