File: img-picture-ancestor.html

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<!DOCTYPE html>
<title>img should only look at a parent picture element</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<picture>
  <source media="not all" srcset="data:,a">
  <source media="all" srcset="data:,b">
  <img src="data:,c">
  <picture>
    <source media="not all" srcset="data:,e">
    <source media="all" srcset="data:,f">
    <img src="data:,g">
  </picture>
</picture>
<script>
const picture1 = document.querySelector("picture");
const picture2 = document.querySelector("picture > picture");
const img1 = document.querySelector("picture > img");
const img2 = document.querySelector("picture > picture > img");

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

const imgInsideDiv = document.createElement("img");
imgInsideDiv.src = "data:,d";
div.append(imgInsideDiv);

test(function() {
  assert_equals(img1.currentSrc, "data:,b");
}, "currentSrc of img in normally parented picture is correct");

test(function() {
  assert_equals(img2.currentSrc, "data:,f");
}, "currentSrc of img in nested picture element is correct");

async_test(function(t) {
  picture1.append(div);
  queueMicrotask(t.step_func(function() {
    assert_equals(imgInsideDiv.currentSrc, "data:,d");
    t.done();
  }));
}, "currentSrc of img with picture ancestor but non-picture parent is correct");

async_test(function(t) {
  picture2.remove();
  queueMicrotask(t.step_func(function() {
    assert_equals(img2.currentSrc, "data:,f");
    t.done();
  }));
}, "currentSrc of img in nested picture element remains correct when the inner picture is removed from the document");
</script>