Rule case will be modified when parse css

[ttttmr]

https://github.com/tdewolff/parse/blob/91901180122e1211ba489e7eac0ad991c0da38b2/css/parse.go#L235 https://github.com/tdewolff/parse/blob/91901180122e1211ba489e7eac0ad991c0da38b2/css/parse.go#L381

There are two ToLower calls here, which will modify the case of the original data when parsing

I don't think it should be modified, especially when the data is not css, some strings in the data may be modified after calling parse

You may need to use Copy like here https://github.com/tdewolff/parse/blob/91901180122e1211ba489e7eac0ad991c0da38b2/html/lex.go#L198

or simply delete this call (I am not very proficient in css, and I don't really understand why it needs to be lowercased here)

[tdewolff]

Thank, should be fixed now. Principally it's used to improve GZIP compression, but I've added Copy to avoid modifying the original.

[tdewolff]

Fixed in https://github.com/tdewolff/parse/commit/98cf927e40837df9e1a0536cb23c5c2e7e694786