W3C home > Mailing lists > Public > www-style@w3.org > May 2012

Re: Vendor-prefixes: an idea

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Mon, 7 May 2012 21:23:40 +0200
Message-ID: <CAAWBYDCt-cYbKozDE8twLYatgznWzS1-949pen5o=DyxKufcog@mail.gmail.com>
To: Maciej Stachowiak <mjs@apple.com>
Cc: Fran├žois REMY <fremycompany_pub@yahoo.fr>, CSS 3 W3C Group <www-style@w3.org>
On Mon, May 7, 2012 at 7:08 PM, Maciej Stachowiak <mjs@apple.com> wrote:
> One other issue with vendor-bang is that it makes it hard on parsing when the !'d version has a distinct syntax from the official, as you have to parse the whole property before you know how to parse it. This is a solvable problem in principle, but it really makes life easier to have a potential syntax switch come at the beginning rather than at the end, for example:
> foo: !-vendor bar;

That's not strictly necessary, but it might be necessary given current
parser designs.  (If your tokenizer and parser are separate passes, as
soon as the parser sees the property name it can read from the end of
the tokens comprising the property value to look for the vendor-bang,
and then parse the remaining tokens only if it finds the right

> Another downside is that the !important syntax is some of the ugliest and most confusing syntax in CSS ("not important means important?") and it would be a shame to propagate it.

True.  We could potentially prefix them with *any* symbol that
currently always tokenizes as a delimiter.  There's a lot of them.

> As far as upsides upsides, this proposal makes it seem a little less psychologically icky to implement someone else's prefix, since you're "ignoring" it rather than "supporting". But the effect is the same.

Shane mentioned this, but I'm not sure I agree.  While the property is
prefixed, "implementing someone else's prefix" means actively checking
for the other vendor's vendor-bang alongside your own, and considering
the property valid if you find either.  However, I can see how it
might feel like a lesser transgression to some people, particularly
since "unprefixing" just means that you stop checking for vendor-bangs

Received on Monday, 7 May 2012 19:24:29 UTC

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