Individual skill

css-containment

Use when reviewing stylesheets, component styles, and responsive behavior related to Use CSS containment to limit repaint scope. Check the rendered layout across breakpoints and interaction states before proposing a fix.

skills/css-containment/SKILL.md

Read pinned source

Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e

What was checked

Matches the observed repository HEAD: Yes
Scanner rules are current: Yes
Repository scan complete: No
Skill scan complete: Yes
Observed behavior: Instructions only
Last checked: Nov 9, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

Install this skill

Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.

An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.

Repository context

Repository stars (not skill ratings): 74,698
Repository last updated: Oct 31, 2026
License: MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

frontend Repository topic
front-end-development Repository topic
front-end-developer-tool Repository topic
guidelines Repository topic
checklist Repository topic
reference Repository topic
web-development Repository topic
html Repository topic
css Repository topic
javascript Repository topic
engineering Derived category

Files and excerpt

File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.

Browse files

SKILL.mdcore · 2,048 bytes
references/rule.mddoc · 3,825 bytes

Read excerpt


# Use CSS containment to limit repaint scope

By default, a CSS change anywhere on the page can potentially affect any other element's layout. CSS containment declares that certain elements are isolated — changes inside them don't affect the outside world. This lets browsers skip large portions of the rendering pipeline for unchanged content, which is especially valuable for pages with many independent components.

## Quick Reference

- contain: layout style paint tells the browser a component is visually self-contained
- content-visibility: auto skips rendering off-screen content entirely
- Containment limits how far layout recalculations need to propagate
- Use contain: strict for widgets with no overflow that shouldn't affect the page

## Check

Identify components in this CSS that are visually self-contained (no overflow, no interaction with elements outside) and could benefit from CSS containment.