UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Safari/605.1.15

Steps to reproduce the problem:
1. Create an html page
2. In the body reference some tag/element that is not defined
3. There is no error, warning whatsoever 

What is the expected behavior?
I would love if there was the option for Chrome Dev Tools to emit a warning when a tag is not recognized as I think this would be super helpful especially in the context of web components. 

What went wrong?
I recently worked on a page with lots of web components and did not notice that the tag name that I used in my html was different from what I had used in window.customElements.define. The tag was visible in the elements panel, no warning was given, I could also select it, but only after half an hour I realized that it not have a shadow root, so began investigating in that direction. I think it would be a nice addition in such cases to display a warning or info to the user of Chrome Dev Tools in the console. 

Did this work before? N/A 

Chrome version: 70.0.3538.77  Channel: stable
OS Version: OS X 10.14
Flash Version:
 

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