The decoding
property of the HTMLImageElement
interface represents a hint given to the browser on how it should decode the image.
Syntax
refStr = imgElem.decoding; imgElem.decoding = refStr;
Values
A DOMString
representing the decoding hint. Possible values are:
-
sync
: Decode the image synchronously for atomic presentation with other content.async
: Decode the image asynchronously to reduce delay in presenting other content.auto
: Default mode, which indicates no preference for the decoding mode. The browser decides what is best for the user.
Usage notes
The decoding
property allows you to control whether or not the browser is allowed to try to parallelize loading your image. If doing so would cause problems, you can specify sync
to disable asynchronous loading. This can be useful when applied to <img>
elements, but may be even more so when used for offscreen image objects.
Examples
var img = new Image(); img.decoding = 'sync'; img.src = 'img/logo.png';
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'decoding' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
decoding | Chrome Full support 65 | Edge Full support ≤79 | Firefox Full support 63 | IE No support No | Opera Full support Yes | Safari Full support 11.1 | WebView Android Full support 65 | Chrome Android Full support 65 | Firefox Android Full support 63 | Opera Android ? | Safari iOS Full support 11.3 | Samsung Internet Android Full support 9.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown