The CSS contain property lets #developers optimize different Web page components' performance, for more efficient rendering/painting #timetoimplement
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You can provide test data for its test suite: test.csswg.org/harness/test/… and/or review the 38 current test cases: test.csswg.org/harness/revie…
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More info on how to send feedback by @frivoal: w3.org/blog/CSS/2018/05/24/u…
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