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diff --git a/layout/base/crashtests/1439016.html b/layout/base/crashtests/1439016.html
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+<!DOCTYPE html>
+<div id="host">
+ <div slot="slot1">content</div>
+</div>
+<script>
+// NOTE(emilio): the failure mode for this crashtest is asserting whenever the
+// shell goes away.
+let shadowRoot = document.querySelector('#host').attachShadow({ mode: 'open' });
+shadowRoot.innerHTML = `
+ <div id="slot1-container">
+ <slot id="slot1" name="slot1"></slot>
+ <button id="button1">Click here</button>
+ </div>
+`;
+
+document.body.offsetTop;
+shadowRoot.querySelector('#slot1-container').remove();
+</script>