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<!DOCTYPE html>
<title>Layout Instability: sources attribute</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<style>
body { margin: 10px; }
#shifter { position: relative; width: 300px; height: 100px; background: blue; }
</style>
<div id="shifter"></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
<script>
strrect = r => `[${r.x},${r.y},${r.width},${r.height}]`;
promise_test(async () => {
const watcher = new ScoreWatcher;
const shifter = document.querySelector("#shifter");
// Wait for the initial render to complete.
await waitForAnimationFrames(2);
// Modify the position of the div.
shifter.style = "top: 60px; left: 10px";
await watcher.promise;
const sources = watcher.lastEntry.sources;
assert_equals(sources.length, 1);
const source = sources[0];
assert_equals(source.node, shifter);
assert_equals(strrect(source.previousRect), "[10,10,300,100]");
assert_equals(strrect(source.currentRect), "[20,70,300,100]");
}, "Sources attribute.");
</script>
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