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-rw-r--r--testing/web-platform/tests/selection/selection-nested-video.html25
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diff --git a/testing/web-platform/tests/selection/selection-nested-video.html b/testing/web-platform/tests/selection/selection-nested-video.html
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+++ b/testing/web-platform/tests/selection/selection-nested-video.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>Selection with nested videos doesn't crash</title>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1887963">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+async_test(t => {
+ document.addEventListener("DOMContentLoaded", () => {
+ let c = a.attachShadow({mode: "open"});
+ const sel = window.getSelection();
+
+ sel.setBaseAndExtent(b, 0, c, 0);
+
+ assert_equals(sel.anchorNode, b);
+ assert_equals(sel.anchorOffset, 0);
+ assert_equals(sel.focusNode, b);
+ assert_equals(sel.focusOffset, 0);
+ t.done();
+ })
+});
+</script>
+<div id="a">A</div>
+<video>
+<video id="b">