pseudo-elements

SKILL.md

Modern CSS pseudo-elements provide direct styling hooks into browser-native features—dialogs, popovers, view transitions—reducing the need for JavaScript. Sometimes you don't need to install a library; the browser has you covered.

| ::before / ::after | Decorative layers, icons, hit targets | | ::view-transition-group(name) | Control view transition animations | | ::view-transition-old(name) | Style the outgoing snapshot | | ::view-transition-new(name) | Style the incoming snapshot | | ::backdrop | Style dialog/popover backdrops | | ::placeholder | Style input placeholders |

Create anonymous inline elements as first/last child. Require content to render.

Modern CSS pseudo-elements for styling without extra DOM nodes. Use when implementing view transitions, adding decorative layers, or styling native browser UI. Triggers on tasks involving ::before, ::after, view-transition, backdrop styling, or reducing JavaScript for visual effects. Source: raphaelsalaja/userinterface-wiki.

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