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Test Info:

/* Any copyright is dedicated to the Public Domain.
"use strict";
// Test the markup view displaying the content of a <template> tag.
add_task(async function () {
const TEST_URL =
`data:text/html;charset=utf-8,` +
encodeURIComponent(`
<div id="root">
<template>
<p>template content</p>
</template>
<div id="template-container" style="border: 1px solid black"></div>
</div>
<script>
"use strict";
const template = document.querySelector("template");
const clone = document.importNode(template.content, true);
document.querySelector("#template-container").appendChild(clone);
</script>`);
const EXPECTED_TREE = `
root
template
#document-fragment
p
template-container
p`;
const { inspector } = await openInspectorForURL(TEST_URL);
const { markup } = inspector;
await assertMarkupViewAsTree(EXPECTED_TREE, "#root", inspector);
info("Select the p element under the template .");
const templateFront = await getNodeFront("template", inspector);
const templateContainer = markup.getContainer(templateFront);
const documentFragmentContainer = templateContainer.getChildContainers()[0];
const pContainer = documentFragmentContainer.getChildContainers()[0];
await selectNode(pContainer.node, inspector, "no-reason", false);
const ruleView = inspector.getPanel("ruleview").view;
// We only display the style attribute.
is(
ruleView.element.querySelectorAll(".ruleview-rule").length,
1,
"No rules are displayed for this p element"
);
});