- From: Zack Weinberg <zackw@panix.com>
- Date: Sat, 20 Jul 2013 12:54:45 -0400
- To: marc@marcomorain.com
- Cc: www-style list <www-style@w3.org>
On Sat, Jul 20, 2013 at 12:46 PM, Marc O'Morain <marc@marcomorain.com> wrote:
>> {
>> width: 100%;
>> }
>
> This input would be accepted by the railroad diagrams (stylesheet =>
> qualified rule => declaration list, bypassing the 'component value' in
> the 'qualified rule' diagram). There should not be a route around the
> 'component value' in 'qualified rule'.
You may have tripped over the less-than-obvious distinction between
grammar productions that accept valid CSS and grammar productions that
arrange for predictable error recovery. If I remember correctly, the
example you show is indeed invalid, but error recovery is supposed to
resynchronize at the close brace; in other words, if there were a
valid rule immediately after the close brace, it would not be
discarded. The way Syntax 3 expresses this (or did the last time I
looked at it anyway) is to say that this does match the qualified-rule
production but then it's invalid because the selector is empty.
zw
Received on Saturday, 20 July 2013 16:55:07 UTC