test_html_template.xhtml

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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>