Properly hide checkbox and radio inputs in button groups

[hnrch02]

pointer-events: none; for modern browsers (including IE11+), clip: rect(1px, 1px, 1px, 1px); for everything else.

Maybe @mdo can give some input on clip, I found various resources online promoting 1px, 1px, 1px, 1px instead of 0, 0, 0, 0.

Fixes #14137.
Per #14137 (comment).

[cvrebert]

Elsewhere, we're currently using clip: rect(0,0,0,0);
Also, switching to clipping to 0 would make the opacity setting unnecessary, right?
Might need to update the explanatory comment that precedes this chunk of declarations.

[hnrch02]

Elsewhere, we're currently using clip: rect(0,0,0,0);

Interestingly, the article linked in the explanatory comment for the .sr-only class also uses clip: rect(1px, 1px, 1px, 1px);.

Also, switching to clipping to 0 would make the opacity setting unnecessary, right?

I suppose so, yes.

Might need to update the explanatory comment that precedes this chunk of declarations.

Will do.

[mdo]

Nice, this sounds reasonable to me. Thanks for updating that comment, too.

I'd love to hear more about the clip differences, but that's not hugely important for this PR. So long as they're the same, I'm good.

[hnrch02]

I don't have any experience with clip, just reciting what I've read online.

[mdo]

Just one more question—this means we don't need to revert the commit mentioned in #14137 (comment), right?

If not, merge away @hnrch02!

[hnrch02]

Nope, that would just have been a dirty workaround.

[hnrch02]

@cvrebert Comment wording LGTY?

[mdo]

Comment looks great to me.

[hnrch02]

Woohoo, first merge 🎉

[mdo]

Aww yeah.

[mdo]

@hnrch02 Can you add a note to #13952 under the appropriate section? Just issue number and basic commit message/summary.

[hnrch02]

Sure, was wondering how that is handled. Always thought it was a bot due to the insane speed of @cvrebert.

[mdo]

The cross reference in the timeline here will always show up as @cvrebert since he opened that issue. Anytime you merge something worth noting, you should update the ship list.

And on the note of it being a bot, I'd love it if it was done by us at GitHub, but that's for another time :).

[hnrch02]

Got it. And looking forward to more GitHub awesomeness in the future. 😁