Limitations you should be aware of when Internet Explorer 9 parses CSS files
Internet Explorer until version 9 has some limitations when parsing CSS files
Summarized, these are:
- Up to 31 CSS files or
- Up to 4095 selectors per CSS file.
- Up to 3 nested @import rules
To test the selector limit for a specific browser, check this CSS selector limitation test website.
When you run into this issue, the following links might be helpful to fix the problem. The Idea is to split up the css files that have been generated by sass.
Some websites (e.g. https://www.devexpress.com/Support/Center/p/K18487.aspx) say there was a css file size limit at about 288kb but this is neither listed in the microsoft knowledge base article nor could this bug be reproduced. I think people ran into the selector limit. If you have a test that approves the file size limit, please give me a shout.
Arne added a repository that holds a few sample files so you can test it yourself.