:is() CSS pseudo-class function takes a selector list as its argument, and selects any element that can be selected by one of the selectors in that list. This is useful for writing large selectors in a more compact form.
All though it is not yet supported by all versions of browsers.
fact :matches() renamed as :is()
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Tools like Page Speed Insights and Google Lighthouse are great for providing advice for front end performance issues. But what these tools can’t do, is evaluate performance across your entire stack of distributed services and applications.
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