Speculation Rules API

Description

Speculation rules offer a way to preemptively load pages for future navigations before the user has actually clicked a link.
Developers can opt to either prefetch, prerender or prerender_until_script.

Specification

https://html.spec.whatwg.org/multipage/speculative-loading.html#speculative-loading

web-feature

https://web-platform-dx.github.io/web-features-explorer/features/speculation-rules/

Test Links

https://wpt.fyi/results/speculation-rules?label=master&label=experimental&aligned&q=speculation

Additional Signals

The Speculation Rules API has been supported in Chrome and Edge since version 109.
The feature has 25 👍 in the developer signals repo.
Speculation Rules had 40 👍 In Interop 2026 and 30 👍 in Interop 2025.

Standards positions:

• Firefox initially expressed a neutral position but have a partial implementation in Firefox Nightly.
• Webkit have expressed support only for same-origin prefetch with an eagerness of conservative.

There are certain aspects of the spec that still seem to be in progress:

• Chromium has an in-progress bug for adding external file support. There is an open pull request for adding this to the specification. There are separate Mozilla and Webkit standards positions for using an external speculationrules file rather than inlining.
• Chrome has been running an origin trial for prerender-until-script

The State of HTML 2025 survey revealed that a majority of developers have not yet heard of this feature, but it is already being used by some large companies such as Shopify, WordPress, Etsy and Google.
This tweet about the API has 558 likes and this other tweet has 1000 likes.

Start with the Speculation Rules API specification and the linked WPT results for speculation-rules to determine what coverage the Interop project would need. The issue names no repository files or tests and does not define a requested change, so the expected coverage and completion criteria require clarification.