This is a testharness.js-based test.
[FAIL] @supports doesn't use unsupported -webkit-user-modify property
  assert_not_equals: got disallowed value "rgb(255, 0, 0)"
[FAIL] CSS.supports doesn't use unsupported -webkit-user-modify property
  assert_equals: expected false but got true
Harness: the test ran to completion.