Version: 51 canary
OS: all

What steps will reproduce the problem?
(1) Open http://w3c-test.org/html/dom/dynamic-markup-insertion/opening-the-input-stream/001.html

What is the expected output? What do you see instead?
Expected: The test passes.
Actual: The test fails.


Please use labels and text to provide additional information.

https://html.spec.whatwg.org/multipage/webappapis.html#dom-document-open
> 15. ...
>   * For the global object, create a new Window object window.


The test passes on Firefox and Edge.