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@media.update-frequency

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.

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.

Example

HTML

<p>If this text animates for you, 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 Status Comment
Media Queries Level 4
The definition of 'update' in that specification.
Candidate Recommendation Initial definition.

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support No ? No No No No
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support ? ? ? ? ? ? ?

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https://developer.mozilla.org/en-US/docs/Web/CSS/@media/update-frequency