Cross-origin frame error #581
Description
No idea what to make of this, but this project throws an uncaught error when you click the button:
Uncaught DOMException: Failed to read the 'contentDocument' property
from 'HTMLIFrameElement': Blocked a frame with origin "null" from
accessing a cross-origin frame.
Original bug report
Submitter: mekhi
this does not work in the preview:
https://gist.github.com/anonymous/8549724468c89747b455b4f7312092fd