Shadow DOM traversal issues

[ricksbrown]

If you have Adblock Plus installed every page you go to gets bundled into a shadow DOM.

This shadow DOM prevents the accessibility developer tools JS library from finding any DOM elements if you do not set a scope, i.e. it defaults to running from document

This does not show up in the unit tests because they always have scope set.

It is pretty easy to work around since you could set scope to document.body but technically it is broken and is bound to affect some users.