This is a testharness.js-based test.
[FAIL] Property background-blend-mode value 'normal, luminosity'
  assert_equals: expected "normal, luminosity" but got "normal"
[FAIL] Property background-blend-mode value 'screen, overlay'
  assert_equals: expected "screen, overlay" but got "screen"
[FAIL] Property background-blend-mode value 'color, saturation'
  assert_equals: expected "color, saturation" but got "color"
Harness: the test ran to completion.