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<!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>
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