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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Mac] requestFrameAnimation callback timestamp should be very close to Performance.now()"
href="https://bugs.webkit.org/show_bug.cgi?id=159038">159038</a>
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<th>Summary</th>
<td>[Mac] requestFrameAnimation callback timestamp should be very close to Performance.now()
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>Animations
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>sabouhallawa@apple.com
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<th>CC</th>
<td>dino@apple.com
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<pre>The current implementation of requestFrameAnimation() passes the sum of timeUntilOutput and Performance.now() to the JS callback. timeUntilOutput is the difference between the outputTime and the now time which are passed to the CVDisplayLink callback. This addition causes the timestamp which is passed to the requestFrameAnimation() callback to be larger than the Performance.now() by almost 33 ms in the future.</pre>
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