Add support for the popover API and for the name attribute on details elements.

[SylvainBoilard]

Hello,

This PR initially added support for the name attribute and specifying a toggle event handler for a details element, and was extended to implement the popover API.

See:

• https://html.spec.whatwg.org/multipage/popover.html ;
• https://html.spec.whatwg.org/multipage/indices.html#event-toggle ;
• https://html.spec.whatwg.org/multipage/interactive-elements.html#the-details-element ;
• https://developer.mozilla.org/en-US/docs/Web/API/Popover_API ;
• https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details#events ;
• https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details#attributes .

See also these related PRs:

• #1728 in js_of_ocaml
• #1734 in js_of_ocaml
• #806 in eliom

Please let me know of any issues.

Cheers,

[Drup]

Thanks !

If I'm reading the spec right, toggle is a valid event for any popover element ... which can be any HTML element. In that case, ontoggle should be a global attribute.

Is that right ? Can you do the modification accordingly ?

[SylvainBoilard]

Yes that is absolutely right; I had initially planned to limit the scope of this PR to the details element but following your input I decided to update it to support the popover API.