source-media-outside-doc.html

Enable keyboard shortcuts

This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-img-element/source-media-outside-doc.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Image source selection using media queries is performed for img elements outside the document</title>

<link rel="help" href="https://html.spec.whatwg.org/#reacting-to-environment-changes">

<link rel="help" href="https://html.spec.whatwg.org/#reacting-to-dom-mutations">

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

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

<iframe width="350" height="100" onload="async_test(this.contentWindow.run)" srcdoc="

<!DOCTYPE html>

<script>

const { assert_equals } = parent;

const iframe = parent.document.querySelector('iframe');

function run(t) {

  const picture = document.createElement('picture');

  const source1 = document.createElement('source');

  source1.setAttribute('media', '(min-width: 300px)');

  source1.setAttribute('srcset', 'data:,a');

  picture.append(source1);

  const source2 = document.createElement('source');

  source2.setAttribute('media', '(min-width: 200px)');

  source2.setAttribute('srcset', 'data:,b');

  picture.append(source2);

  const img = document.createElement('img');

  img.src = 'data:,c';

  picture.append(img);

  queueMicrotask(t.step_func(function() {

    assert_equals(img.currentSrc, 'data:,a', 'Initial currentSrc value');

    matchMedia(source1.media).addEventListener(

      'change',

      function() {

        queueMicrotask(t.step_func(function() {

          assert_equals(img.currentSrc, 'data:,b', 'After MQ change');

          img.remove();

          queueMicrotask(t.step_func(function() {

            assert_equals(img.currentSrc, 'data:,c', 'After removing img');

            t.done();

          }));

        }));

},

      { once: true }

);

    iframe.width = 250;

  }));

</script>

"></iframe>