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HTMLLinkElement: fetchPriority property

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The fetchPriority property of the HTMLLinkElement interface represents a hint given to the browser on how it should prioritize the preload of the given resource relative to other resources of the same type.

Value

A string representing the priority hint. Possible values are:

high: Fetch the preload at a high priority relative to other resources of the same type.
low: Fetch the image at a low priority relative to other resources of the same type.
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 preload fetches. This can be useful when applied to <link> elements to signal preloads that are more or less 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 resource automatically. Over use can result in degrading performance.

Examples

const preloadLink = document.createElement("link");
preloadLink.href = "myimage.jpg";
preloadLink.rel = "preload";
preloadLink.as = "image";
preloadLink.fetchPriority = "high";
document.head.appendChild(preloadLink);

Specifications

Specification
HTML Standard # attr-link-fetchpriority

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`fetchPriority`	102101–102	102101–102	No	No	8887–88	preview	102101–102	102101–102	No	70	No	19.0

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https://developer.mozilla.org/en-US/docs/Web/API/HTMLLinkElement/fetchPriority