<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-values-5/#progress">
<link rel="author" title="sakhapov@chromuim.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../support/parsing-testcommon.js"></script>
<script>
function test_invalid_number(value) {
  test_invalid_value('opacity', value);
}
function test_invalid_length(value) {
  // 'letter-spacing' accepts <length> only, not <percentage> or any mixes.
  test_