Files
stack/packages/mosaic/framework/skills/vercel-react-best-practices/rules/rendering-content-visibility.md
T
fargo 1a822493ba format: apply repo prettier (3.8.1) to the folded skills tree
963 markdown files reformatted with the repository's pinned prettier so
pnpm format:check covers the folded tree like every other repo file.

The formatter's embedded-language pass also normalized code fences
(TS semicolons, closed HTML tags in examples, lowercased CSS hex colors,
one renumbered list that skipped an index). Alphanumeric token deltas vs
the fold commit were audited file-by-file; all are formatter-equivalent
markup normalizations plus the four sanitized skills.
2026-08-19 14:37:17 -05:00

818 B
Raw Blame History

title, impact, impactDescription, tags
title impact impactDescription tags
CSS content-visibility for Long Lists HIGH faster initial render rendering, css, content-visibility, long-lists

CSS content-visibility for Long Lists

Apply content-visibility: auto to defer off-screen rendering.

CSS:

.message-item {
  content-visibility: auto;
  contain-intrinsic-size: 0 80px;
}

Example:

function MessageList({ messages }: { messages: Message[] }) {
  return (
    <div className="overflow-y-auto h-screen">
      {messages.map((msg) => (
        <div key={msg.id} className="message-item">
          <Avatar user={msg.author} />
          <div>{msg.content}</div>
        </div>
      ))}
    </div>
  );
}

For 1000 messages, browser skips layout/paint for ~990 off-screen items (10× faster initial render).