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<!DOCTYPE html>
<title>Layout Instability: source attribution prioritization</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/test-adapter.js"></script>
<script src="resources/util.js"></script>
<style>
body { margin: 0; }
#a, #b, #c, #d, #e, #f {
display: inline-block;
background: gray;
min-width: 10px;
min-height: 10px;
vertical-align: top;
}
#a { width: 30px; height: 30px; }
#b { width: 20px; height: 20px; }
#c { height: 50px; }
#d { width: 50px; }
#e { width: 40px; height: 30px; }
#f { width: 30px; height: 40px; }
</style>
<div id="grow"></div>
<div id="a"></div
><div id="b"></div
><div id="c"></div
><div id="d"></div
><div id="e"></div
><div id="f"></div>
<script>
let $ = id => document.querySelector(id);
promise_test(async () => {
const watcher = new ScoreWatcher;
// Wait for the initial render to complete.
await waitForAnimationFrames(2);
$("#grow").style.height = "50px";
await watcher.promise;
cls_expect(watcher, {sources: [
{
node: $("#a"),
previousRect: [0, 0, 30, 30],
currentRect: [0, 50, 30, 30]
},
{
node: $("#f"),
previousRect: [150, 0, 30, 40],
currentRect: [150, 50, 30, 40]
},
{
node: $("#c"),
previousRect: [50, 0, 10, 50],
currentRect: [50, 50, 10, 50]
},
{
node: $("#d"),
previousRect: [60, 0, 50, 10],
currentRect: [60, 50, 50, 10]
},
{
node: $("#e"),
previousRect: [110, 0, 40, 30],
currentRect: [110, 50, 40, 30]
}
]});
}, "Source attribution prioritizes by impact.");
</script>
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