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

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<title>'font-weight' property</title>
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<script>
'use strict';

function assert_is_font_weight(weight, result) {
  assert_style_value_equals(result, new CSSUnitValue(weight, 'number'));
}

runPropertyTests('font-weight', [
  {
    syntax: 'normal',
    computed: (_, result) => assert_is_font_weight(400, result)
  },
  {
    syntax: 'bold',
    computed: (_, result) => assert_is_font_weight(700, result)
  },
  {
    syntax: 'bolder',
    computed: (_, result) => assert_is_unit('number', result)
  },
  {
    syntax: 'lighter',
    computed: (_, result) => assert_is_unit('number', result)
  },
  {
    syntax: '<number>',
    specified: (input, result) => {
      if (input instanceof CSSUnitValue &&
          (input.value < 1 || input.value > 1000))
        assert_style_value_equals(result, new CSSMathSum(input));
      else
        assert_style_value_equals(result, input);
    }
  },
]);

</script>