"The rest of the elements either require no additional behavior or are trivially implementable using Custom Element callbacks." bothers me a bit. Other mentions of trivial do too, if it was trivial it would have been done by now.
<select> is hard. Requires at least a new privileged CSS primitive to draw outside a viewport. Form submission needs to be explained.
<input> seems hard. Does this bottom out to contenteditable in implementations or something else? I suspect something else. Form submission again. Also needs a way to say that certain pseudo-classes match at particular points in time.
<fieldset> is "hard". Requires new CSS primitives.
"The rest of the elements either require no additional behavior or are trivially implementable using Custom Element callbacks." bothers me a bit. Other mentions of trivial do too, if it was trivial it would have been done by now.
<select>
is hard. Requires at least a new privileged CSS primitive to draw outside a viewport. Form submission needs to be explained.<input>
seems hard. Does this bottom out tocontenteditable
in implementations or something else? I suspect something else. Form submission again. Also needs a way to say that certain pseudo-classes match at particular points in time.<fieldset>
is "hard". Requires new CSS primitives.