Re: [w3c/editing] spellchecking - how to give JS devs more control (#166)

> What it does is it creates an element that overlays the existing textarea/CE with the same content but with marked ranges and then it hopes that this doesn't interfere with the JS app it's working on.

FWIW too, the `range.decorate` concept could also be useful for displaying multiple cursors, as I believe the "duplicate content overlay" is how many editors end up implementing those as well, which seems like a huge pain to implement and maintain.

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