<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 - wheel event triggered only once per touchpad touch"
href="https://bugs.webkit.org/show_bug.cgi?id=149526">149526</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wheel event triggered only once per touchpad touch
</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>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>Mac OS X 10.11
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>Critical
</td>
</tr>
<tr>
<th>Priority</th>
<td>P2
</td>
</tr>
<tr>
<th>Component</th>
<td>Event Handling
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>m.goleb+bugzilla@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Open <a href="http://output.jsbin.com/mimiqi/">http://output.jsbin.com/mimiqi/</a> in Safari 9 and scroll using a MacBook touchpad. The counter at the top left shows how many times the wheel event is fired. In all browsers except Safari 9 (i.e. Chrome, Firefox, **even Safari 8**) the event is fired once per animation frame. Safari 9 USUALLY fires it only once per touching the touchpad, although sometimes it switches into once-per-frame mode (scroll a little in various directions and you should see it).
This will break many interactions that depend on wheel happening in every animation frame to provide a custom scroll-like UI.
Note that I can't reproduce this new broken behavior on JSFiddle which may mean it doesn't happen in iframes (the test case is identical): <a href="http://jsfiddle.net/eoxzpqn5/">http://jsfiddle.net/eoxzpqn5/</a>
Is there any chance of this getting fixed in Safari 9? Seems pretty severe to me. :(</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>