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Summary
This PR adds the new attributes from the Popover API to the list of allowed HTML attributes. This includes:
popover
popovertarget
popovertargetaction
These attributes are used to identify popover elements and control their behaviour. I don't believe they can be used to trigger scripts in any way, but please let me know if I'm wrong.
Thanks!
Background & Context
This API is quite new, but support for it is already estimated at ~84% (caniuse).