sources.html - mozsearch

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /layout-instability/sources.html - WPT Dashboard Interop Dashboard

<!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>