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.has() compatibility in fireox

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deepthi.ms
deepthi.ms
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I hear that enabling .has() for CSS in about.config in browser level is done for testing purposes. Will it be enabled by default in future? Is there a way to do it in our site programmatically

I hear that enabling .has() for CSS in about.config in browser level is done for testing purposes. Will it be enabled by default in future? Is there a way to do it in our site programmatically