LayoutTests/fast/ruby/ruby-overhang-computed.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>ruby-overhang computed value: 'none' is a legacy alias of 'spaces'</title>
<link rel="help" href="https://drafts.csswg.org/css-ruby-1/#propdef-ruby-overhang">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<div id="target"></div>
<script>
function test_computed_value(value, expected) {
  test(() => {
    const target = document.getElementById('target');
    target.style.setProperty('ruby-overhang', '');
    target.style.setProperty('ruby-overhang', value);
    assert_equals(getComputedStyle(target).getPropertyValue('ruby-overhang'), expected);
  }, `Property ruby-overhang value "${value}" computes to "${expected}"`);
}
test_computed_value('auto', 'auto');
test_computed_value('spaces', 'spaces');
test_computed_value('none', 'spaces');
</script>