HTML Remote Debugging: document.registerElement

General
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Not sure about that but I’d recommend:

  1. Go to chrome://inspect/#devices
  2. Check Discover network targets
  3. Click Configure and add 127.0.0.1:8081

In a few seconds you should get the running templates listed on the page.

Then you can use the latest Chrome DevTools instead of the one in Chromium.

Update: document.registerElement was part of web components v0 and deprecated (so it’s used in the old Devtools in Chromium but no longer supported in Chrome). You could use an older version of Chrome if you want but the method above is far superior.