rendering-content-visibility

title: CSS content-visibility for Long Lists
impact: HIGH
impactDescription: faster initial render
tags: 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).