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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-img-element/srcset/srcset-media-dynamic.html 

<!doctype html>
<title>source element in picture handles dynamic media change correctly.</title>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1523627">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<picture id="pic">
  <source srcset="data:,a">
</picture>
<script>
let t = async_test("Dynamic media change is handled correctly");

let pic = document.getElementById("pic");
// Something that will never match.
pic.querySelector("source").setAttribute("media", "not all");

let img = document.createElement("img");
img.src = "data:,b";
pic.appendChild(img);

onload = t.step_func_done(function() {
  assert_equals(img.currentSrc, "data:,b");
});
</script>