Comment on My favourite 3 lines of CSSparentComments−ironmagma3yI was more referring to margin-block-start, var (with two arguments), gap... Also, no, sibling selector wasn't really supported very well until 2012, so only in the last ~30% of CSS's lifetime.
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I was more referring to margin-block-start, var (with two arguments), gap... Also, no, sibling selector wasn't really supported very well until 2012, so only in the last ~30% of CSS's lifetime.