gulp-clean-css底層用的是clean-css,更多參數(shù)可以看clean-css的內(nèi)容。

關(guān)于這個(gè)參數(shù)： 其文檔也有說明>>

For example, this declaration --compatibility 'ie8,+units.rem' will ensure IE8 compatiblity while enabling rem units so the following style margin:0px 0rem can be shortened to margin:0, while in pure IE8 mode it can't be.