This is a testharness.js-based test.
[FAIL] Link preload "as" value for "video" should be "video".
  assert_equals: expected "video" but got ""
[FAIL] Link preload "as" value for "audio" should be "audio".
  assert_equals: expected "audio" but got ""
[FAIL] Link preload "as" value for "json" should be "json".
  assert_equals: expected "json" but got ""
[FAIL] Link preload "as" value for "text" should be "text".
  assert_equals: expected "text" but got ""
Harness: the test ran to completion.