This is a testharness.js-based test.
[FAIL] ShadowRoot.createElement() for autonomous custom element
Illegal constructor
[FAIL] ShadowRoot.createElementNS() for autonomous custom element
Illegal constructor
[FAIL] ShadowRoot.createElement() for customized built-in element
Illegal constructor
[FAIL] ShadowRoot.createElementNS() for customized built-in element
Illegal constructor
Harness: the test ran to completion.