update is a CSS media feature that can be used to check how quickly (if at all) the output device is able to modify the appearance of the content.
| Value | Meaning |
|---|---|
none | |
slow | |
fast |
| Specification | Status | Comment |
|---|---|---|
| Media Queries Level 4 The definition of 'update' in that specification. | Working Draft | Initial definition |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | ? | ? | ? | ? | ? |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | ? | ? | ? | ? | ? |
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https://developer.mozilla.org/en-US/docs/Web/CSS/@media/update-frequency