The fetchPriority property of the HTMLImageElement interface represents a hint given to the browser on how it should prioritize the fetch of the image relative to other images.

A string representing the priority hint. Possible values are:

high

Fetch the image at a high priority relative to other images.

low

Fetch the image at a low priority relative to other images.

auto

Default mode, which indicates no preference for the fetch priority. The browser decides what is best for the user.

The fetchPriority property allows you to signal high or low priority image fetches. This can be useful when applied to <img> elements to signal images that are "important" to the user experience early in the loading process.

The effects of the hint on resource loading is browser-specific so make sure to test on multiple browser engines.

Use it sparingly for exceptional cases where the browser may not be able to infer the best way to load the image automatically. Over use can result in degrading performance.