It seems there are several CSS errors in files we are shipping with the browser because the files are imported as-is, and they use some cross-browser prefixed things. I think it would be helpful to have a script to strip all those things for CSS files we are shipping, so that we have much fewer errors produced inside the browser.
I mean, do the stripping in build time, instead of in the source code.
I guess there are several other kinds of errors we can remove in the script.
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