update

Baseline 2023
Newly available

Since September 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

The update CSS media feature can be used to test how frequently (if at all) the output device is able to modify the appearance of content once rendered.

css
@media (update: < none | slow | fast >) {
  /* styles to apply if the update frequency of the output device is a match */
}

Syntax

The update feature is specified as a single keyword value chosen from the list below.

none

Once it has been rendered, the layout can no longer be updated. Example: documents printed on paper.

slow

The layout may change dynamically according to the usual rules of CSS, but the output device is not able to render or display changes quickly enough for them to be perceived as a smooth animation. Examples: e-book readers or severely underpowered devices.

fast

The layout may change dynamically according to the usual rules of CSS, and the output device is not unusually constrained in speed, so regularly-updating things like CSS Animations can be used. Example: computer screens.

Examples

HTML

html
<p>
  If this text animates for you, your browser supports `update` and you are
  using a fast-updating device.
</p>

CSS

css
@keyframes jiggle {
  from {
    transform: translateY(0);
  }

  to {
    transform: translateY(25px);
  }
}

@media (update: fast) {
  p {
    animation: 1s jiggle linear alternate infinite;
  }
}

Result

Specifications

Specification
Media Queries Level 4
# update

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
update media feature

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support

See also