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

Re: Comment syntax

From: Kang-Hao (Kenny) Lu <kanghaol@oupeng.com>
Date: Mon, 27 Aug 2012 19:44:18 +0800
Message-ID: <503B5D92.7060508@oupeng.com>
To: "Zachary “Gamer_Z.” Yaro" <zmyaro@gmail.com>, Liam R E Quin <liam@w3.org>
CC: WWW Style <www-style@w3.org>, "Jens O. Meiert" <jens@meiert.com>
(12/08/26 11:10), Zachary “Gamer_Z.” Yaro wrote:
> I still do not quite see why the existence of minifiers matters here at
> all.  

Well, it means that minimizers have to support //-style comments or it
will turn out disastrous once Web Developers start to use these without
updating their CSS minimizer. Also, it seems that CSS minimizers don't
get update too frequently either (for example, YUI compressor[1] was
last updated a year ago).

Pragmatically speaking, browsers implementing //-style comments would
honor much fewer style rules an input like

  //some comments. a {...} div {...} section {...}

(a very likely output from YUI compressor given //-style comments) then
a browser not implementing //-style, which means that it's more likely
for users of browsers implementing //-style to see pages broken. In such
case, users will criticize browsers instead of Web developers or
developers of the CSS minimizers, and that will be the reason why
browser implementers don't want to adopt this.

> Devs who use minifiers could just choose not to use // comments 

Yes, that's a solution to the potential disaster(s). Not adopting //
comments in the standards is another solution, with better backwards

My point is that we all have a rough idea of the pros and cons here. We
just need quantitative data, or just more data in general.

> (and minifiers would likely update to support them if they became 
> standard).

(12/08/25 13:01), Liam R E Quin wrote:
> <span style="color: red;// background-color: yellow; font-size:
> 36pt;"> Is "font-size" commented out in (1) the mind of the author,
> (2) the mind of the parser?

Can you elaborate? Are you suggesting "font-size" should not be
commented out? That would be another proposal D.

> In
> <span style="color: red;
>             // background-color: yellow;
>             font-size: 36pt;">
> how does attribute value normalization interact with the comment?

What is attribute value normalization?

> What about css minimization tools that remove as much whitespace as
> possible?

So I did a bit of investigation in to CSS minimization tools. Two common
CSS minimization tools mentioned my Web developers folks in the Chinese
HTML5 IG, LESS and stylus, already support //-style comments (However,
these two tools already diverge largely from the CSS syntax).

On the other hand, some of the top hits when I google "css minimizer",
including YUI compressor and CSSO (CSS Optimizer) do turn line feeds
into whitespace.

I suggest whoever is interested in pushing //-style comments contact
developers of YUI compressor and CSSO and persuade them to implement
//-style comments.

[1] http://yuilibrary.com/download/yuicompressor/

Web Specialist, Oupeng Browser, Beijing
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Received on Monday, 27 August 2012 11:44:51 UTC

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