Chrome 138 adds speculation rules target_hint and Clear-Site-Data: {prefetchCache,prerenderCache}

[tunetheweb]

Summary

Chrome 138 will add two new features for Speculation Rules:

• target_hint
• clear-site-data

This will probably be picked up by BCD collector soon, but there's a note I want to add to target_hint, and I have the docs in mdn/content#39652 so thought I'd go ahead and raise this.

Test results and supporting details

target_hint: https://prerender-demos.glitch.me/target-hint.html
https://wpt.fyi/results/speculation-rules/prerender?label=experimental&label=master&aligned

clear-site-data:
https://wpt.fyi/results/speculation-rules/prefetch/clear-prefetch-cache-after-clear-site-data-cache.tentative.https.html?label=experimental&label=master&aligned
https://wpt.fyi/results/speculation-rules/prerender/cancel-prerendering-after-clear-site-data-cache-different-origins.tentative.https.html?label=experimental&label=master&aligned
https://wpt.fyi/results/speculation-rules/prerender/cancel-prerendering-after-clear-site-data-cache-same-origin.tentative.https.html?label=experimental&label=master&aligned

(note some of the clear-site-data WPT tests are a little flakey so may show it as not passing - we're working on it!)

target_hint

Chrome Status link: https://chromestatus.com/feature/5162540351094784
Explainer link: https://github.com/WICG/nav-speculation/blob/main/triggers.md#window-name-targeting-hints

Clear-site-data

Chrome Status link: https://chromestatus.com/feature/4755745652080640
Explainer link: https://github.com/WICG/nav-speculation/blob/main/clear-site-data-integration.md

Related issues

See content PR here: mdn/content#39652

[github-actions]

Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).