patch-self-scripting.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/patch-self-scripting.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset="utf-8" />

<title>HTML partial updates - executing scripts during streaming</title>

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

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

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

<div id="placeholder">

</div>

<script>

promise_test(async t => {

    const placeholder = document.querySelector("#placeholder");

    const writable = placeholder.patchSelf();

    assert_true(writable instanceof WritableStream, "node.patchSelf() returns a writable stream");

    const response = new Response("Content", {headers: {"Content-Type": "text/html"}});

    window.script_executed = false;

    const did_write_promise = writable.getWriter().write(`

        <br id=before>

        <script>

            assert_not_equals(document.querySelector("#before"), null);

            assert_equals(document.querySelector("#after"), null);

            window.script_executed = true;

        <` + `/script>

        <br id=after>`);

    assert_false(window.script_executed, "script should not execute before write() resolves");

    await did_write_promise;

    assert_not_equals(document.querySelector("#before"), null);

    assert_not_equals(document.querySelector("#after"), null);

    assert_true(window.script_executed, "script should execute immediately upon being written");

}, "Patches should execute scripts as soon as they are written");

</script>