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Proposal of CSS CC
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// Hidden syntax (C-style):
@cc lte IE 8
// Revealed syntax (BASIC-style):
@cc !IE begin;
// Non-IE browsers would simply ignore @cc (standard behavior with
// unknown @ blocks and instructions).
If the following code fails to exclusively detect Firefox..
Use “Downlevel-revealed Conditional Comments” to get it working…
Example to force Firefox to use an exclusive css..
Valid HTML for downlevel-revealed conditional comments
This topic used to include a discussion of how to create downlevel-revealed conditional comments that are valid HTML 4.01. This discussion appears to have gone missing. Thanks to search engine caches, we can reproduce it below:
Fixing Validation Errors
The downlevel-revealed conditional comment syntax is flagged as invalid HTML by some validation services. Additional characters can be added to construct a valid HTML Comment before and after the HTML content to be revealed.In the example above, the negative conditional expression prevents Internet Explorer from displaying the HTML content within the downlevel-revealed conditional comment block. However, if the conditional expression evaluates to true, the closing “–>” of the first comment appears along with the HTML content in Internet Explorer. To hide these characters from Internet Explorer users, add ” HTML