Practical translation table

Below is an accessible text version of the example table in the proposal.

FCC Requirement (§14.21)	User experience problem	14ten solution
14.21.b.2.iv: Provide accurate, synchronous captions.	“Did the captions actually appear? Were they readable?”	Generate Evidence (caption logs, timing traces) to back an Assertion of compliance.
14.21.b.4.i: Enable third-party sign language interpretation.	“Could my interpreter connect, and was the video quality sufficient?”	Generate Evidence (e.g., video quality for signing report) to prove the platform met technical standards.
14.21.b.4.ii: Provide UI controls for captions and signers.	“Can I pin my interpreter and resize the caption window?”	Emit ui.a11y_state signals confirming controls were present and functioned.

Pattern

1. Translate obligations into observable signals.
2. Persist proof as evidence.
3. Generate audit-ready assertions tied to evidence.