rendering-content-visibility

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

Skills
Web development
1

What it does and how to use it

A skill that teaches Claude Code to do web development tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
In Claude Code, describe what you need - the skill turns on by itself when the context fits.
No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/rendering-content-visibility && curl -fsSL https://doutorai.pt/data/lib/skills__rendering-content-visibility.md -o .claude/skills/rendering-content-visibility/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

---
title: CSS content-visibility for Long Lists
impact: MEDIUM
impactDescription: 10× 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:**

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

**Example:**

```tsx
function MessageList({ messages }: { messages: Message[] }) {
  return (
    <div className="overflow-y-auto h-screen">
      {messages.map(msg => (
        <div key={msg.id} className="message-item">
  

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