<!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)',
                '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)',
                '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');

// All <basic-shape-rect>s compute to the equivalent inset() function, so
// they are interpolatable.
// https://drafts.csswg.org/css-shapes-1/#basic-shape-computed-values
// https://github.com/w3c/csswg-drafts/issues/9053
test(function(t) {
  var div = createDiv(t);
  div.style.clipPath = 'inset(10px round 20px)';
  div.style.transition = 'all 100s linear -50s';
  getComputedStyle(div).clipPath;

  // The equivalent function is
  // "inset(10px calc(100% - 220px) calc(100% - 110px) 20px)".
  div.style.clipPath = 'xywh(20px 10px 200px 100px)';
  assert_equals(getComputedStyle(div).clipPath,
                'inset(10px calc(50% - 105px) calc(50% - 50px) 15px round 10px)',
                'The equivalent inset at 50%');
}, 'Test inset and xywh on clip-path');

</script>
</html>
