gecko-dev/testing/web-platform/tests/custom-elements/reactions/Selection.html

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<!DOCTYPE html>
<html>
<head>
<title>Custom Elements: CEReactions on Selection interface</title>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<meta name="assert" content="deleteFromDocument of Selection interface must have CEReactions">
<meta name="help" content="http://w3c.github.io/selection-api/#selection-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/custom-elements-helpers.js"></script>
<script src="./resources/reactions.js"></script>
</head>
<body>
<div id="log"></div>
<script>
testNodeDisconnector(function (customElement, window) {
let selection = window.getSelection();
let parent = customElement.parentNode;
// WebKit and Blink "normalizes" selection in selectAllChildren and not select the empty customElement.
// Workaround this orthogonal non-standard behavior by inserting text nodes around the custom element.
parent.prepend(document.createTextNode('start'));
parent.append(document.createTextNode('end'));
selection.selectAllChildren(parent);
selection.deleteFromDocument();
}, 'deleteFromDocument on Selection');
</script>
</body>
</html>