This is a testharness.js-based test.
[FAIL] Property image-rendering value 'optimizequality'
  assert_true: 'optimizequality' is a supported value for image-rendering. expected true got false
[FAIL] Property image-rendering value 'optimizespeed'
  assert_true: 'optimizespeed' is a supported value for image-rendering. expected true got false
Harness: the test ran to completion.