HTMLLinkElement: fetchPriority property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
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 resource at a high priority relative to other resources of the same type.
low-
Fetch the preload resource 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 # dom-link-fetchpriority |
Browser compatibility
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