<!doctype html>
<meta charset=utf-8>
<meta name="assert"
      content="This test checks if the inerpolation on clip-path is correct" />
<title>Tests for the output of the interpolation of clip-path</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id='log'></div>
<script type='text/javascript'>
'use strict';

function createDiv(test) {
  var element = document.createElement('div');
  document.body.appendChild(element);
  test.add_cleanup(function() {
    element.remove();
  });
  return element;
}

test(function(t) {
  var div = createDiv(t);
  div.style.clipPath = 'circle(25px)';
  // The radius becomes negative between 60%~61%, so we set the delay to -61s.
  div.style.transition = 'all 100s cubic-bezier(0, 0, 1, -60) -61s';
  getComputedStyle(div).clipPath;

  div.style.clipPath = 'circle(26px)';
  assert_equals(getComputedStyle(div).clipPath, 'circle(0px at 50% 50%)',
                'The radius of circle is clamped to zero at 61%');
}, 'Test circle with negative easing on clip-path');

test(function(t) {
  var div = createDiv(t);
  div.style.clipPath = 'ellipse(25px 25px)';
  // The radius becomes negative between 60%~61%, so we set the delay to -61s.
  div.style.transition = 'all 100s cubic-bezier(0, 0, 1, -60) -61s';
  getComputedStyle(div).clipPath;

  div.style.clipPath = 'ellipse(26px 26px)';
  assert_equals(getComputedStyle(div).clipPath, 'ellipse(0px 0px at 50% 50%)',
                'The radius of ellipse is clamped to zero at 61%');
}, 'Test ellipse with negative easing on clip-path');

test(function(t) {
  var div = createDiv(t);
  div.style.clipPath = 'inset(10% round 25px)';
  // The radius becomes negative between 60%~61%, so we set the delay to -61s.
  div.style.transition = 'all 100s cubic-bezier(0, 0, 1, -60) -61s';
  getComputedStyle(div).clipPath;

  div.style.clipPath = 'inset(10% round 26px)';
  assert_equals(getComputedStyle(div).clipPath, 'inset(10%)',
                'The radius of inset is clamped to zero at 61%');
}, 'Test inset with negative easing on clip-path');

</script>
</html>
