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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Decouple the percent height and positioned descendants maps."
href="https://bugs.webkit.org/show_bug.cgi?id=158773">158773</a>
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<th>Summary</th>
<td>Decouple the percent height and positioned descendants maps.
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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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>Layout and Rendering
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>zalan@apple.com
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<th>CC</th>
<td>simon.fraser@apple.com
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<pre>While we track the elements with percent height through multiple containers (direct parent, indirect parent), a positioned element can only have one containing block.
Sharing the same data structure between these 2 concepts is defective.
precent height element with multiple containers -> typedef WTF::HashMap<const RenderBox*, std::unique_ptr<HashSet<const RenderBlock*>>> TrackedContainerMap;
positioned element with single containing block -> typedef HashMap<const RenderBox*, const RenderBlock*> TrackedContainerMap;</pre>
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