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From "Jeanne Waldman (JIRA)" <>
Subject [jira] Commented: (TRINIDAD-205) Need to avoid IE's number of CSS selectors limitation
Date Wed, 27 Aug 2008 17:19:44 GMT


Jeanne Waldman commented on TRINIDAD-205:

I looked at the code briefly and it looks like it would work. However, I think the implementation
I mentioned in my note above is cleaner. Blake and I discussed some approaches together and
this is the one we felt was cleanest because it kept the knowledge of the file limitations
to the writeCSS code. What do you think? 

> Need to avoid IE's number of CSS selectors limitation
> -----------------------------------------------------
>                 Key: TRINIDAD-205
>                 URL:
>             Project: MyFaces Trinidad
>          Issue Type: Bug
>    Affects Versions: 1.0.1-incubating-core-SNAPSHOT
>            Reporter: Jeanne Waldman
>            Assignee: Simon Lessard
>         Attachments: TRINIDAD-205.patch
> it turns out that IE has a limit to the size of a CSS file. It's not the actual size
of the file, but rather it is the
> # of CSS selectors. I did a test and found out that the limit is 4095 CSS selectors.
> Firefox doesn't appear to have a limit.
> As you may know, the CSS file we generate contains both compressed and uncompressed styles,
like this:
> .af_inputText_content, .x01 {background-color: blue}
> Our renderers render a shortened styleclass, unless
> the DISABLE_CONTENT_COMPRESSION flag is set to true in web.xml, then it renders the long
> <input class="x01...>
> Ok, that's the background.
> *The problem* is that because we have a lot of custom components that we've built on
top of Trinidad, and our customers
> have built custom components, etc, and these all have skinning,
> we have bumped up against the 4095 selector limit in IE. All selectors after the 4095th
one are ignored.
> *A quick fix*, and probably a good one for a long time, is to render the styles in compressed
mode when compression is on,
> or in uncompressed mode when compression if off. That will reduce our style selectors
by 1/2, and will help performance to boot. :)
> I can also add a warning if we go past 4095 selectors for IE.
> Another solution is to break up the file into multiple files when I've reached the limit
in one file, and include
> all the css files into the rendered page. I can do this in addition to the quick fix
when I have more time.

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