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  • Dmytro Gokun thinks this is interesting:

So h1, h2, h3 will select all elements that are inside either an h1 element or an h2 element or an h3 element

Note

Incorrect. This will only select "h1, h2, h3" itself, not "all elements that are inside either an h1 element or an h2 element or an h3 element".