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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 id=s1 media=all srcset="data:,s1">
<source id=s2 media=all srcset="data:,s2">
<source id=s3 media=all srcset="data:,s3">
<img id=img1 src="data:,img1">
<img id=img2 src="data:,img2">
<source id=s4 media=all srcset="data:,s4">
<source id=s5 media=all srcset="data:,s5">
<source media=all srcset="data:,s6">
</picture>
<script>
const picture = document.querySelector("picture");
const img1 = document.getElementById("img1");
const img2 = document.getElementById("img2");
const source1 = document.getElementById("s1");
const source2 = document.getElementById("s2");
const source3 = document.getElementById("s3");
const source4 = document.getElementById("s4");
const source5 = document.getElementById("s5");
promise_test(async () => {
// Wait for the relevant mutation microtask to run.
await Promise.resolve();
assert_equals(img1.currentSrc, "data:,s1", "[img1] First source is correctly chosen");
assert_equals(img2.currentSrc, "data:,s1", "[img2] First source is correctly chosen");
// Triggers a relevant mutation for *all* image children under the parent
// `<picture>` element to update their source.
source1.remove();
await Promise.resolve();
assert_equals(img1.currentSrc, "data:,s2",
"[img1] Second source is chosen after first is removed");
assert_equals(img2.currentSrc, "data:,s2",
"[img2] Second source is chosen after first is removed");
source2.remove();
await Promise.resolve();
assert_equals(img1.currentSrc, "data:,s3",
"[img1] Third is chosen after first is removed");
assert_equals(img2.currentSrc, "data:,s3",
"[img2] Third is chosen after first is removed");
document.body.moveBefore(source3, null);
await Promise.resolve();
assert_equals(img1.currentSrc, "data:,img1",
"[img1] Img src attribute is chosen after third source is moved");
assert_equals(img2.currentSrc, "data:,img2",
"[img2] Img src attribute is chosen after third source is moved");
source4.remove();
await Promise.resolve();
assert_equals(img1.currentSrc, "data:,img1",
"[img1] Img src attribute is unchanged after source is removed from after the img");
assert_equals(img2.currentSrc, "data:,img2",
"[img2] Img src attribute is unchanged after source is removed from after the img");
document.body.moveBefore(source5, null);
await Promise.resolve();
assert_equals(img1.currentSrc, "data:,img1",
"[img1] Img src attribute is unchanged after source is moved from after the img");
assert_equals(img2.currentSrc, "data:,img2",
"[img2] Img src attribute is unchanged after source is moved from after the img");
picture.prepend(source2);
await Promise.resolve();
assert_equals(img1.currentSrc, "data:,s2",
"[img1] Second source is chosen after inserted before the img element");
assert_equals(img2.currentSrc, "data:,s2",
"[img2] Second source is chosen after inserted before the img element");
picture.prepend(source1);
await Promise.resolve();
assert_equals(img1.currentSrc, "data:,s1",
"[img1] First source is chosen after inserted before the img element");
assert_equals(img2.currentSrc, "data:,s1",
"[img2] First source is chosen after inserted before the img element");
}, "Neither the removing, moving, nor insertion steps for the source element " +
"track the previous 'next sibling' pointer when triggering relevant " +
"mutations for remaining child image elements of its old parent");
</script>
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