{"id":653,"slug":"view-transitions-cross-doc-limited-no-firefox","title":"Cross-document View Transitions are Limited Availability — Chrome/Edge 126+, Safari 18.2+, Firefox not yet shipped","kind":"reference","scope":"business","status":"current","audiences":["claude-code","candid-team"],"topics":["view-transitions","css-architecture"],"reference_body":"**Claim:** Cross-document View Transitions (`@view-transition { navigation: auto; }`) are Limited Availability as of May 2026.\n\n**Verbatim (MDN `@view-transition` page, updated April 20, 2026):** *\"This feature is not Baseline because it does not work in some of the most widely-used browsers.\"*\n\n**Support:** Chrome 126+, Edge 126+, Safari 18.2+; Firefox has not shipped.\n\n**Confidence:** Verified.\n\n**Pattern:** literally one CSS rule, degrades gracefully. Adopt as progressive enhancement on every Astro/multi-page site.\n\n**Perf caveat (Web Perf Clinic 2026 RUM data):** cross-document view transitions add ~70ms to LCP on repeat mobile pageviews. Mitigation: pair with [[speculation-rules-moderate-eagerness-default]] so the prerendered page's LCP element is already painted.\n\n**Conflicting source note:** Some third-party guides still claim Safari has not shipped cross-document VTs; MDN, web.dev, CSS-Tricks, and RUMVision confirm Safari 18.2+ has shipped support. Treat MDN/web.dev as authoritative.","rationale_body":null,"metadata":null,"links":{"outgoing":[{"slug":"view-transitions-same-doc-baseline-oct-2025","title":"Same-document View Transitions became Baseline Newly Available on October 14, 2025 (Firefox 144)","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"speculation-rules-moderate-eagerness-default","title":"Speculation Rules with eagerness:\"moderate\" is the 2026 default for instant navigation; ~82% LCP improvement in CoreDash field data","kind":"reference","scope":"business","link_type":"relates-to"}],"incoming":[]},"created_at":"2026-05-22T21:24:18.307Z","updated_at":"2026-05-22T21:24:18.307Z"}