In this Hasty Treat, Scott and Wes talk about new CSS selectors :has, :where, and :is.

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Show Notes

• 00:25 Welcome
• 01:19 Sponsor: MagicBell
• 02:31 Sponsor: LogRocket
• 03:40 Don’t say stupid
• 05:03 :Has
• MDN :Has

// Finds all p tags that have an anchor tag as a child p:has(a) {} // Can find children of parent as well // Finds the button of a paragraph that contains an a tag p:has(a) button {} // Finds all p tags that don't have an anchor tag as a child p:not(:has(a)) {} // Finds all p tags where a is a direct sibling p:has(> a) {} // would find

Hi

// would not find

hi

• 06:13 Jargon check
• 11:01 Some examples
• 13:25 Nest navigations
• 13:51 Can I use it?
• 15:52 Is and Where
• MDN :where

In the past we would write

header p:hover, main p:hover, footer p:hover { color: red; cursor: pointer; }

:where is essentially a short had for making this easier considering the 2nd half of these selectors is the same. Will make your css dryer

:where(header, main, footer) p:hover {}

Also super handy in avoiding css blocks being ignored for unsupported features.

// Doesn't work div:has(p), div:some_new_selector(p) // Will still work for :has if has is supported :where(div:has(p), div:some_new_selector(p))

• When to use :Where

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