What tool is Critical?

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Critical is another tool for dealing with the CSS critical path problem mentioned in the previous section. For best performance, programmers may need to consider inserting critical CSS directly into HTML documents, as this eliminates extra round trips to critical paths.

The concrete practice of this idea is to find key CSS rules and place them in the section of the HTML document. Critical generates and inlines the critical path CSS, and programmers can use both Grunt and Gulp.

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