Add popover=hint feature

[mfreed7]

Specification

whatwg/html#9778

Description

The Popover API specifies the behavior for two values of the popover attribute: auto and manual. This feature describes a third value, popover=hint. Hints, which are most often associated with "tooltip" type behaviors, have slightly different behaviors. Primarily, the difference is that hints are subordinate to autos when opening nested stacks of popovers. So it is possible to open an unrelated hint popover while an existing stack of auto popovers stays open. The canonical example is that a picker is open (popover=auto) and a hover-triggered tooltip (popover=hint) is shown. That action does not close the picker.

Documentation

https://open-ui.org/components/popover-hint.research.explainer/

Browser support

Chrome is planning to ship this feature (subject to approval) in v133: https://chromestatus.com/feature/5073251081912320

[captainbrosset]

@mfreed7 do you know if anyone if this is tracked to be added to BCD (browser-compat-data)? I couldn't find an issue, but may have missed it.
Also, do you know when we can expect the spec PR to be merged?

[mfreed7]

@mfreed7 do you know if anyone if this is tracked to be added to BCD (browser-compat-data)? I couldn't find an issue, but may have missed it.

Yep: mdn/mdn#593

Also, do you know when we can expect the spec PR to be merged?

See my comment here whatwg/html#9778 (comment) - I'm hoping we can land it now that the objection has been removed. We'll see!