`update` CSS media feature

Baseline Widely available

This feature is well established and works across many devices and browser versions. It's been available across browsers since September 2023.

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.

Syntax

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

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

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

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`update`	113	113	102	99	17	113	102	76	17	23.0	113	17