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chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/the-stylepropertymap/properties/stroke-opacity.html 

<!doctype html>
<meta charset="utf-8">
<title>'stroke-opacity' property</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../resources/testhelper.js"></script>
<script src="resources/testsuite.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';

function assert_is_equal_with_clamping_number(input, result) {
  const number = input.to('number');

  if (number.value < 0)
    assert_style_value_equals(result, new CSSUnitValue(0, 'number'));
  else if (number.value > 1)
    assert_style_value_equals(result, new CSSUnitValue(1, 'number'));
  else
    assert_style_value_equals(result, input);
}

function assert_is_equal_with_clamping_percentage(input, result) {
  const number = input.to('percent').value / 100.;

  if (number < 0)
    assert_style_value_equals(result, new CSSUnitValue(0, 'number'));
  else if (number > 1)
    assert_style_value_equals(result, new CSSUnitValue(100, 'number'));
  else
    assert_style_value_equals(result, new CSSUnitValue(number, 'number'));
}

runPropertyTests('stroke-opacity', [
  {
    syntax: '<number>',
    computed: assert_is_equal_with_clamping_number
  },
  { syntax: '<percentage>',
    computed: assert_is_equal_with_clamping_percentage
  }
]);

</script>