JIT-4 The JIT-4 platform

Web 5 — exact line, verified

Address the sentence; open the right UI state; highlight; verify; survive edits and translations.

Why Web 4 → Web 5

Web 4 fixed money-in-motion: SaaS-first assembly and self-describing pages.

But decisions live at the sentence: page-level signals can’t prove a claim or survive edits/migrations/language drift.

Web 5 adds portability of truth: addressable sentences, open-state hints, verification, drift signals, and locale-true resolution.

Browser path (today → native)

  • Today: ship as a tiny JS/edge layer (progressive enhancement).
  • Native candidate: content-addressed fragments with short-hash verify; open-and-highlight hint; sentence-level changefeed; locale-true resolution.
  • Fallbacks: nearest heading when a line moves; visible drift badge.

Adopt when…

  • Weekly attention spikes and repeat questions.
  • Upcoming theme/platform move.
  • Multi-locale audiences needing line-true parity.
  • Compliance/exec pressure for citable truth and freshness.
  • Tiny team + near-term ROI needed.