gecko-dev/dom/xul/test/test_html_template.xul

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<?xml version="1.0"?>
<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
<window title="HTML template in XUL"
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js" />
<body xmlns="http://www.w3.org/1999/xhtml">
<template id="template">Content<span>Content</span></template>
<script type="application/javascript"><![CDATA[
add_task(async function test_template() {
let template = document.getElementById("template");
ok("content" in template, "Template has shadow root.");
is(template.childNodes.length, 0, "Template should have no children.");
is(template.content.childNodes.length, 2, "Template content should have two children.");
});
]]></script>
</body>
</window>