| Harness Error (TIMEOUT), message = null | |
| PASS Discarding the browsing context must not change window.customElements | |
| FAIL Navigating from the initial about:blank must not replace window.customElements assert_equals: expected object "[object CustomElementRegistry]" but got object "[object CustomElementRegistry]" | |
| FAIL document.open() must replace window.customElements assert_not_equals: got disallowed value object "[object CustomElementRegistry]" | |