Style containment
The contain: style CSS declaration permits the browser to avoid slower layout calculations by preventing modification to counter (counter-increment and counter-set) and quotation styles (content property quote values) beyond the element's descendants.
Browser support
| Feature | Desktop | Mobile | ||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Safari | Chrome Android | Safari iOS | |
css.properties.contain.style | 52 | 79 | 103 | 15.4 | 52 | 15.4 |
1+Supported (version) Not supported ※Has note Sub-feature descriptions sourced from MDN Web Docs (CC BY-SA 2.5)
Notes 1 item(s)
Implementation note
- Before Chrome 115, style containment did not affect quotes, see bug 40592922.
Notes 1 item(s)
Implementation note
- Before Edge 115, style containment did not affect quotes, see bug 40592922.
Notes 1 item(s)
Implementation note
- Style containment does not affect quotes, see bug 232083.
Notes 1 item(s)
Implementation note
- Before Chrome Android 115, style containment did not affect quotes, see bug 40592922.
Notes 1 item(s)
Implementation note
- Style containment does not affect quotes, see bug 232083.
Syntax
CSS
.component {
contain: style;
}
.isolated-counter {
contain: style;
counter-reset: items;
}Live demo
Use cases
-
Using Style containment
The contain: style CSS declaration permits the browser to avoid slower layout calculations by preventing modification to counter (counter-increment and counter-set) and quotation styles (content property quote values) beyond the element's descendants.
Cautions
- May not be supported in older browsers.
Accessibility
- Make sure visual changes are conveyed appropriately to assistive technology.