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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Shadow DOM]: :host-context rule does not apply to matching nodes within the shadow root"
href="https://bugs.webkit.org/show_bug.cgi?id=160038">160038</a>
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<th>Summary</th>
<td>[Shadow DOM]: :host-context rule does not apply to matching nodes within the shadow root
</td>
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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>Safari Technology Preview
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
</td>
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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>CSS
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>cdata@google.com
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<pre>Please consider the following test cases:
<a href="http://output.jsbin.com/menajes">http://output.jsbin.com/menajes</a> (Custom Elements & Shadow DOM)
<a href="http://output.jsbin.com/gafocub">http://output.jsbin.com/gafocub</a> (Shadow DOM only)
The test cases feature two elements, each with a similar attached shadow root. The stylesheet within each shadow root contains a rule whose selector includes :host-context([dir="rtl"]).
What I expected to happen:
The contents in the second shadow root match the :host-context selector, causing text to be aligned to the right.
What actually happened:
The contents in the second shadow root is incorrectly aligned to the left.
The :host-context feature is extremely useful for navigating style encapsulation in some situations. As demonstrated in the test cases, it is probably the best way to conditionally style a shadow root's elements when RTL is set by some uncertain ancestor of the host.</pre>
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