document-base-url-changes-after-nav-about-srcdoc.https.window.js

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/infrastructure/urls/base-url/document-base-url-changes-after-nav-about-srcdoc.https.window.html - WPT Dashboard Interop Dashboard

// META: script=/common/get-host-info.sub.js

//

// A test to verify that, when a srcdoc frame is created when it's parent

// has a non-default base URI, and is later restored from history, it has

// the same baseURI it started with, even if the parent has changed its own

// baseURI in the meantime.

// The parent always communicates with the child via postMessage since some

// of the test cases include the child being sandboxed.

async function sendMessage(frame, msg) {

  const result = new Promise(r => onmessage = e => r(e.data));

  frame.postMessage(msg, "*");

  return await result;

const runTest = (description, sandbox_flags) => {

  promise_test(async test => {

    const original_parent_baseURI = document.baseURI;

    // Create a URL for the child frame to navigate to.

    const nav_target =

        (new URL('./resources/send-back-base-url.html', location.href)).href;

    // Change parent to a non-default baseURI.

    const base_element = document.createElement("base");

    base_element.href = get_host_info().REMOTE_ORIGIN;

    document.head.appendChild(base_element);

    assert_not_equals(document.baseURI, original_parent_baseURI,

        "parent baseURI failed to change.");

    const non_default_parent_baseURI = document.baseURI;

    // Create child and load a srcdoc frame.

    const iframe = document.createElement("iframe");

    if (sandbox_flags !== null)

      iframe.sandbox = sandbox_flags;

    iframe.srcdoc = `

      <head>

      <script>

        addEventListener('message', (event) => {

          if (event.data == 'report baseURI')

            event.source.postMessage(document.baseURI, event.origin);

          if (event.data == 'click link')

            document.getElementById('link').click();

});

        parent.postMessage('loaded', '*');

      </scr`+`ipt>

      </head>

      <body>

      <a id='link' href='` + nav_target+ `'>link</a>

      </body>

`;

    const child_loaded = new Promise(r => onmessage = e => r(e.data));

    document.body.appendChild(iframe);

    assert_equals(await child_loaded, "loaded");

    // Verify child's baseURI matches parent.

    const child_base_uri = await sendMessage(frames[0], "report baseURI");

    assert_equals(child_base_uri, non_default_parent_baseURI);

    // Navigate child frame to non-srcdoc.

    const child_loaded2 = await sendMessage(frames[0], "click link");

    assert_equals(child_loaded2, "loaded");

    const child_base_uri2 = await sendMessage(frames[0], "report baseURI");

    assert_not_equals(child_base_uri2, non_default_parent_baseURI);

    assert_not_equals(child_base_uri2, original_parent_baseURI);

    assert_equals(child_base_uri2, nav_target);

    // Parent resets its baseURI.

    base_element.remove();

    assert_equals(document.baseURI, original_parent_baseURI,

        "parent baseURI failed to reset.");

    // Navigate child back and verify its baseURI didn't change.

    const child_loaded3 = new Promise(r => onmessage = e => r(e.data));

    window.history.back();

    assert_equals(await child_loaded3, "loaded");

    const child_base_uri3 = await sendMessage(frames[0], "report baseURI");

    assert_equals(child_base_uri3, non_default_parent_baseURI);

  }, description);

runTest("non-sandboxed srcdoc - parent changes baseURI",null);

runTest("sandboxed srcdoc - parent changes baseURI", "allow-scripts");