`document.createElement('x-appbar');` causes crash

[secretrobotron]

This line fails when trying to create an appbar via document.createElement: https://github.com/x-tag/appbar/blob/master/src/appbar.js#L6

[sole]

Thanks for reporting!

Just tried this right now using the latest version, I can't reproduce it with Nightly. Might I suggest next time you let us know which browser version are you using and also maybe provide a working example so we can try to replicate?

Closing, feel free to reopen if you see it happening again!