File: transform-non-invertible-no-transition.html

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<!DOCTYPE html>
<meta charset="UTF-8">
<title>transform interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-transforms-1/#matrix-interpolation">
<meta name="assert" content="transform does not transition between non-invertible and invertible matrices">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>

<style>

#target {
  transition: transform 1s;
}

</style>
<div id="target"></div>
<script>
promise_test(async t => {
  await waitForAnimationFrames(1);
  const target = document.getElementById("target");
  getComputedStyle(target).transform; // ensure there's a before-change style
  target.style.transform = "matrix3d(2,0,0,0, 0,2,0,0, 0,0,0,0, 0,0,0,1)";
  assert_equals(document.getAnimations().length, 0, "No transitions");
}, "Setting 'transform' to a non-invertible matrix does not yield a CSS Transition");
</script>