Re: [w3c/webcomponents] Cleaning up (undefining) custom elements? (#754)

The fact that custom elements can’t be redefined essentially makes them unusable within [Observable’s](https://observablehq.com) [reactive notebook environment](https://observablehq.com/@observablehq/how-observable-runs). Our runtime is predicated on being able to re-evaluate cells whenever either the code in a cell changes, or a value it references changes. So, you can’t really use custom elements within Observable, because every time you change the code, you can’t cleanup the old definition before you re-evaluate the cell.

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