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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Update the semantics of defined-ness of custom elements per spec changes"
href="https://bugs.webkit.org/show_bug.cgi?id=161570">161570</a>
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<th>Summary</th>
<td>Update the semantics of defined-ness of custom elements per spec changes
</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
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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
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>HTML DOM
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
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<th>Reporter</th>
<td>rniwa@webkit.org
</td>
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<th>CC</th>
<td>cdumez@apple.com
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<th>Blocks</th>
<td>154907
</td>
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<pre>There has some changes to the way a custom element becomes :defined.
Namely, when a custom element constructor throws an exception,
the element is no longer considered as defined.
Furthermore, we should not try to upgrade such an element
when it's inserted back into a document.
Update our implementation of custom elements per these spec changes.</pre>
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