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Re: [css-overflow] A question about overflow-x and overflow-y

From: Justice <justice360@gmail.com>
Date: Tue, 31 May 2016 17:51:12 +0800
Message-ID: <CAGD6YKV2tEUZoVY6kvhO=bNBNK9mXXtvy-Nn=duw2F2oxQwYYw@mail.gmail.com>
To: Florian Rivoal <florian@rivoal.net>
Cc: www-style list <www-style@w3.org>
Thanks Florian.

Any one of overflow-x and overflow-y being `hidden` will trigger BFC, which
don't have to break anything of spec. "BFC in one dimension" doesn't have
to exist here. So I don't think it's something prevents `visible` +

As you said, scrollbars actually don't break `visible` + `hidden` either
(in this combination, we don't need scrollbars).

So I assume it's more of a history and compatibility issue?

On Tue, May 31, 2016 at 9:10 AM, Florian Rivoal <florian@rivoal.net> wrote:

> > On May 30, 2016, at 18:24, Justice <justice360@gmail.com> wrote:
> >
> > Hi,
> >
> > According the spec, for the same element, the computed values of these
> two props cannot be visible+hidden at the same time. Does anybody know why
> it is designed this way? Or it's just because of compatibilities?
> Besides history and compatibility requirements, I think the two main
> reasons are:
> * overflow: hidden does more than just hide the overflow, it also makes
> turns the element into a Block Formatting Context (Floats don't escape,
> margins of children don't collapse with margins of parents...). Being a BFC
> in one dimension only is not a thing that exists.
> * if an element could be overflow-x: visible and overflow-y: scroll, you
> would have a vertical scrollbar on the right (typically) side of the
> element, overlapping with the visibly overflowing content in the inline
> direction, which is terrible. Same for visible + auto. This isn't
> necessarily a problem for visible+hidden, but at least it explains why the
> other values cannot be combined with visible.
>  - Florian
Received on Tuesday, 31 May 2016 09:51:40 UTC

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