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Missing CSS optimization - !important
Please update the CSS optimizations in NUglify to remove the space before !important.
Instead of color:red !important the optimized CSS should be color:red!important.
so the AjaxMinifier codebase from which this code comes contain this:
// issue #21057 - do not trip space before !important keyword.
Can we try and find this to find out what the reason was, maybe we're overlooking something
There is nothing in the CSS syntax that requires a space. Perhaps a very old browser, maybe even something like IE4, had a bug that required a space, but I don't believe anything in use today would do that.
Here is a Stack Overflow answer that references the CSS spec: https://stackoverflow.com/a/31143078/776587
You're probably right, AjaxMin goes back years and supported ancient browsers