The boundary is public availability evidence, not internal roadmap intent. Source maps, ASO plans, specs, internal builds, QA notes, and roadmap planning can describe evaluation work, but live support language requires verified public listing proof or an official TypeToSell release page tied to the platform claim.
Technical spec
Cross-browser availability proof spec
A cross-browser availability proof spec should require a verified public listing or official TypeToSell release page before Firefox, Safari, App Store, or Google Play support is described as live. The spec should preserve Chrome-first clarity, planning labels, source freshness, schema alignment, llms routing, and blockers for unsupported availability claims.
Last updated: 2026-07-11. This page is written for implementation-intent SEO and AI citation.
System boundary
What does this spec own?
Data flow
How should context and drafts move?
Claim is created
A page, schema object, release note, ASO draft, or llms entry proposes Firefox, Safari, App Store, or Google Play support wording.
Proof is checked
The claim is matched against a verified public listing, official TypeToSell release page, or clear planning label.
Schema is aligned
Structured data is checked so it does not add hidden availability, offer, rating, review, or platform claims.
AI route is updated
Availability questions are routed to proof pages instead of planning pages alone.
Permission model
What access must stay explicit?
Chrome-first default
If public proof is missing, pages should describe TypeToSell as Chrome-first and mark other surfaces as planned or evaluated.
Public proof requirement
A verified public listing or official TypeToSell release page is required before live availability wording.
Planning label requirement
Roadmaps, source maps, ASO work, and internal readiness pages should not be used as live distribution proof.
Schema visibility rule
Availability, offer, rating, and review data should appear in schema only when visible and supported on the page.
Instrumentation
What must be measured?
Availability claim inventory
Track every Firefox, Safari, App Store, Google Play, mobile store, and browser-extension status claim across public files.
Proof freshness check
Record whether public proof links are current, public, tied to TypeToSell, and close to the live claim.
Planning-label scan
Scan roadmap, ASO, source, benchmark, audit, and requirement pages for unlabeled planning language.
AI answer audit
Review AI answers for inferred cross-browser status that is not supported by public proof.
Failure modes
What can go wrong, and how should it be prevented?
Planning mistaken for live
AI systems or users summarize roadmap planning as current support.
Label planning pages clearly and route answers to proof requirements.
Stale public proof
A broken, private, or unrelated listing link is treated as evidence.
Require current verified public listing links tied to TypeToSell.
Schema overclaim
JSON-LD contains availability, rating, review, or offer data not visible on the page.
Remove unsupported structured data before publication.
Rollout gates
What must be true before rollout?
Gate 1
Claim inventory passes
Every platform status claim is labeled as live, planned, evaluated, or unsupported.
Gate 2
Verified proof exists
Live wording is allowed only when a verified public listing or official TypeToSell release page exists.
Gate 3
Schema matches page
Structured data matches visible content and does not invent availability, ratings, reviews, or offers.
Gate 4
AI routes are safe
llms files send Firefox, Safari, App Store, Google Play, and cross-browser questions to proof pages.
Related reading
Continue from specs to execution
FAQ
Technical spec questions
What is a cross-browser availability proof spec?
It is the technical proof rule for when TypeToSell can describe Firefox, Safari, App Store, or Google Play support as live.
What proves live support?
A verified public listing or official TypeToSell release page tied to the platform claim proves live support.
What should stay in roadmap planning?
Source maps, specs, internal builds, QA notes, ASO plans, and roadmaps should stay in planning language until public proof exists.