Shadow Root Location Error for XPath

[titusfortner]

When attempting to locate an element in a Shadow Root with XPath it results in an "invalid argument" error.

Selenium received a PR to prevent users from using XPath for shadow roots (SeleniumHQ/selenium#11893)

I would prefer not to have custom Selenium errors for things drivers do not (yet?) support. Would it be possible for the driver to give a more clear error, perhaps a "unsupported operation" error with a message about XPath not working?

[titusfortner]

Oops, Chrome not Firefox. I'll raise a new error once I run on nightly 😉

[whimboo]

Probably it should be discussed over on w3c/webdriver#1610 first if it will be fine to raise a unsupported operation error in those cases. That way we will have an agreement and each driver could behave the same. Shall we close this issue for now?

[titusfortner]

I thought I had closed it. Thanks for raising in w3c.