Abnormal performance of css under browser F12

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all the rules for debugging css files in Google browser F12 are shown on the first line and are not compressed. Normally, the number of lines will be displayed
add: it is not possible to change browsers

Front-end javascript html5 chrome css

Mar.10,2021

Does

use any framework to compress css files automatically when compiling?
you click on the browser to see if it is really on line 1

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