BASELINE NowYouCanUse.com

Limited Availability

id: speculation-rules

Speculation rules

Speculation rules are hints to the browser to proactively download pages in the background so they appear instantly when the user navigates to them.

Baseline Status: This feature is currently Limited and is missing in at least one major browser engine.

Desktop Browser Engine Support

Google Chrome

109

Supported

Mozilla Firefox

—

Unsupported

Apple Safari

—

Unsupported

Microsoft Edge

109

Supported

Mobile Browser Engine Support

Chrome Android

109

Firefox Android

—

Safari iOS

—

Specifications and References

Specification ↗ Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

api.Document.prerendering ↗ api.Document.prerenderingchange_event ↗ api.PerformanceNavigationTiming.activationStart ↗ api.Request.destination.speculationrules ↗ html.elements.script.type.speculationrules ↗ html.elements.script.type.speculationrules.eagerness ↗ html.elements.script.type.speculationrules.expects_no_vary_search ↗ html.elements.script.type.speculationrules.prefetch ↗ html.elements.script.type.speculationrules.prerender ↗ html.elements.script.type.speculationrules.referrer_policy ↗ html.elements.script.type.speculationrules.relative_to ↗ html.elements.script.type.speculationrules.requires ↗ html.elements.script.type.speculationrules.requires.anonymous-client-ip-when-cross-origin ↗ html.elements.script.type.speculationrules.source_optional ↗ html.elements.script.type.speculationrules.tag ↗ html.elements.script.type.speculationrules.target_hint ↗ html.elements.script.type.speculationrules.urls ↗ html.elements.script.type.speculationrules.where ↗ http.headers.Content-Security-Policy.script-src.inline-speculation-rules ↗ http.headers.Sec-Purpose.speculationrules ↗ http.headers.Sec-Speculation-Tags ↗ http.headers.Speculation-Rules ↗ http.headers.Supports-Loading-Mode ↗ http.headers.Supports-Loading-Mode.credentialed-prerender ↗ http.headers.Supports-Loading-Mode.fenced-frame ↗