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Re: [css3-conditional] @supports API

From: L. David Baron <dbaron@dbaron.org>
Date: Tue, 11 Oct 2011 12:32:04 -0700
To: François REMY <fremycompany_pub@yahoo.fr>
Cc: Peter Beverloo <peter@lvp-media.com>, Paul Irish <paul.irish@gmail.com>, www-style@w3.org
Message-ID: <20111011193204.GA25846@pickering.dbaron.org>
On Tuesday 2011-10-11 20:48 +0200, François REMY wrote:
> Just a question: wouldn't it better to have a "full parser" that can
> recognize any piece valid CSS ?
> window.recognizeCSS("x::scrollbar {}"); // false
> window.recognizeCSS("* { width: 1px; }"); // true
> window.recognizeCSS("* { -unknown-property: 3 }"); // false

The problem with that approach is that a full parser has rules for
ignoring invalid things at certain points:  for example, while
parsing a rule, invalid declarations are dropped; while parsing the
top level of a style sheet, invalid rules are dropped.  (There are
further rules for media queries and for handling of errors inside
various types of @-rules.)

With an API like this, it's not clear which errors are handled by
dropping (as per the normal parsing rules) and which are handled by
having the API return false.


𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                           http://www.mozilla.org/   𝄂
Received on Tuesday, 11 October 2011 19:32:36 UTC

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