stream-append-with-template-contentmethod.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/dom/partial-updates/tentative/stream-append-with-template-contentmethod.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset="utf-8" />

<title>streamHTML methods can apply template with contentmethod</title>

<link rel=help href="https://github.com/WICG/declarative-partial-updates">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<body>

<div contentname=p id="placeholder">Old content</div>

<script>

promise_test(async t => {

    const writable = document.body.streamAppendHTMLUnsafe();

    const writer = writable.getWriter();

    await writer.write('<template contentmethod="replace-children">');

    await writer.write("<div contentname=p>");

    await writer.write("New content");

    await writer.write("</div>");

    await writer.close();

    assert_equals(document.querySelector("#placeholder").textContent, "New content")

});

</script>