Document-write-appending-line-feed.html

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /trusted-types/Document-write-appending-line-feed.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

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

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

<link rel="help" href="https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#document-write-steps">

<meta name="assert" content="U+000A LINE FEED is only appended for document.writeln() and only after the arguments are concatenated and sanitized.">

<meta http-equiv="Content-Security-Policy" content="require-trusted-types-for 'script';">

<body>

<script>

  trustedTypes.createPolicy('default', { createHTML: x => `[${x}]` });

  const customPolicy =

    trustedTypes.createPolicy('custom', { createHTML: x => `(${x})` });

  const cleanupPolicy =

    trustedTypes.createPolicy('cleanup', { createHTML: x => x });

  const doc = (new DOMParser()).parseFromString(`<body></body>`, "text/html");

  function cleanup() { doc.body.innerHTML = cleanupPolicy.createHTML(""); }

  test(t => {

    t.add_cleanup(cleanup);

    let a = customPolicy.createHTML("1");

    let b = customPolicy.createHTML("2");

    let c = customPolicy.createHTML("3");

    let d = customPolicy.createHTML("4");

    doc.write(a, b, c, d);

    assert_equals(doc.body.innerHTML, "(1)(2)(3)(4)");

  }, "document.write() with TrustedHTML arguments only.");

  test(t => {

    t.add_cleanup(cleanup);

    let a = "1"

    let b = "2"

    let c = "3";

    let d = "4"

    doc.write(a, b, c, d);

    assert_equals(doc.body.innerHTML, "[1234]");

  }, "document.write() with String arguments only.");

  test(t => {

    t.add_cleanup(cleanup);

    let a = customPolicy.createHTML("1");

    let b = customPolicy.createHTML("2");

    let c = "3";

    let d = customPolicy.createHTML("4");

    doc.write(a, b, c, d);

    assert_equals(doc.body.innerHTML, "[(1)(2)3(4)]");

  }, "document.write() with TrustedHTML for all but one argument.");

  test(t => {

    t.add_cleanup(cleanup);

    let a = customPolicy.createHTML("1");

    let b = customPolicy.createHTML("2");

    let c = customPolicy.createHTML("3");

    let d = customPolicy.createHTML("4");

    doc.writeln(a, b, c, d);

    assert_equals(doc.body.innerHTML, "(1)(2)(3)(4)\n");

  }, "document.writeln() with TrustedHTML arguments only.");

  test(t => {

    t.add_cleanup(cleanup);

    let a = "1"

    let b = "2"

    let c = "3";

    let d = "4"

    doc.writeln(a, b, c, d);

    assert_equals(doc.body.innerHTML, "[1234]\n");

  }, "document.writeln() with String arguments only.");

  test(t => {

    t.add_cleanup(cleanup);

    let a = customPolicy.createHTML("1");

    let b = customPolicy.createHTML("2");

    let c = "3";

    let d = customPolicy.createHTML("4");

    doc.writeln(a, b, c, d);

    assert_equals(doc.body.innerHTML, "[(1)(2)3(4)]\n");

  }, "document.writeln() with TrustedHTML for all but one argument.");

</script>