This feature allows developers to specify decoding attribute on HTMLImageElement and SVGImageElement which would have one of two states: “async”: This indicates that the developer prefers responsiveness and performance over atomic presentation of image and non-image content. “sync”: This indicates that the developer prefers atomic presentation of content over responsiveness. "auto": This indicates a default state where the user-agent can select the behavior.



Specification link

Final published standard: Recommendation, Living Standard, Candidate Recommendation, or similar final form

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.


Search tags

img async, image async,

Last updated on 2020-11-09