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chromium/third_party/blink/web_tests/external/wpt/css/css-animations/animation-iteration-count-009.html 

<!doctype html>
<meta charset=utf-8>
<title>CSS Animation Test: fractional animation-iteration-count</title>
<link rel="help" href="https://drafts.csswg.org/css-animations/#animation-iteration-count">
<link rel="author" title="Martin Robinson" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<style>
@keyframes margin-animation {
  from {
    margin-left: 0px;
  }
  to {
    margin-left: 100px;
  }
}
</style>
<div id="log"></div>
<script>
'use strict';

promise_test(async t => {
  const div = addDiv(t);
  div.style.animation = 'margin-animation 1s -10s linear 1.5 normal forwards paused';
  assert_equals(getComputedStyle(div).marginLeft, '50px');
}, 'Basic floating point iteration count');

promise_test(async t => {
  const div = addDiv(t);
  div.style.animation = 'margin-animation 1s -10s linear 3.25 normal forwards paused';
  assert_equals(getComputedStyle(div).marginLeft, '25px');
}, 'Floating point iteration count after multiple iterations');

promise_test(async t => {
  const div = addDiv(t);
  div.style.animation = 'margin-animation 1s -10s linear 0.75 normal forwards paused';
  assert_equals(getComputedStyle(div).marginLeft, '75px');
}, 'Floating point iteration count during first iteration');

promise_test(async t => {
  const div = addDiv(t);
  div.style.animation = 'margin-animation 1s -10s linear 1.75 alternate forwards paused';
  assert_equals(getComputedStyle(div).marginLeft, '25px');
}, 'Floating point iteration count with alternating directions');
</script>