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chromium/third_party/blink/web_tests/external/wpt/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.layer.ctm.getTransform</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.layer.ctm.getTransform</h1>
<p class="desc">Tests getTransform inside layers.</p>


<script>
test(t => {
  var canvas = new OffscreenCanvas(100, 50);
  var ctx = canvas.getContext('2d');

  ctx.translate(10, 20);
  ctx.beginLayer();
  ctx.scale(2, 3);
  const m = ctx.getTransform();
  assert_array_equals([m.a, m.b, m.c, m.d, m.e, m.f], [2, 0, 0, 3, 10, 20]);
  ctx.endLayer();

}, "Tests getTransform inside layers.");
</script>