Request for Mozilla Position on an Emerging Web Specification

• Specification Title: Priority Hints
• Specification or proposal URL: https://github.com/WICG/priority-hints, Standardize Priority Hints whatwg/html#3670

Other information

Currently web developers have very little control over the heuristic importance of loaded resources, other than speeding up their discovery using <link rel=preload>. Browsers make many assumptions on the importance of resources based on the resource's type (AKA its request destination), and based on its location in the containing document.

This spec proposes to give developers the control to indicate a resource's relative importance to the browser. This would allow the browser to act on those indications to modify the time it sends out the request and its HTTP/2 dependency/weight so that important resources are fetched and used earlier.

In theory, giving the developer control over priority may lead to an improved the user experience.