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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - node.replaceChild(node.lastChild, node.firstChild) should add two mutation records"
href="https://bugs.webkit.org/show_bug.cgi?id=148781">148781</a>
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<th>Summary</th>
<td>node.replaceChild(node.lastChild, node.firstChild) should add two mutation records
</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>WebKit Nightly Build
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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
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>rniwa@webkit.org
</td>
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<pre>Because of the way replaceChild is defined (<a href="https://dom.spec.whatwg.org/#dom-node-replacechild">https://dom.spec.whatwg.org/#dom-node-replacechild</a>),
it should add two mutation records when the inserted node was originally a sibling of the reference child.
e.g. node.replaceChild(node.lastChild, node.firstChild) when node has two children.
This bug was found by the newly added test: LayoutTests/http/tests/w3c/dom/nodes/MutationObserver-childList.html</pre>
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