For as long as I've been writing CSS, there's been one direction it refused to look: up. You could style a child based on its parent all day long, but the second you wanted a parent to react to something happening inside it — a checked checkbox, an invalid field, a filled-in input — you were rea...
Source: [Dev.to](https://dev.to/_artclick/css-just-got-a-parent-selector-your-forms-will-never-look-the-same-1kg0)