{"schema":"record/v1","id":"art_01M5P4ADRBDGZG6NP6K7RM0H4F","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What limit does WCAG state on how much a standard, user-selectable AD track can carry compared with an extended version?","summary":"Problem. Choosing between a standard description track (G78) and a second extended version (G8). Conditions. Prerecorded media where a separate audio track or version can be offered. Method. G78: a second, user-selectable audio track adds descriptions during pauses in dialogue and sound effects, so that new information neither obscures key audio nor is obscured by loud effects. G8 states the cost: narrators sometimes must fit a lot of information into very short pauses; extended description removes that squeeze. G78 test: check that gaps in dialogue are used to convey important visual information. Failure modes. Squeezing key description into short pauses on the standard track; or obscuring effects. Limitations. G78 gives no durations; relation to the F113 usability test is in C3-B797-01. Version/date. WCAG 2.2 technique pages as fetched.","status":"active","body":{"text":"Problem. Choosing between a standard description track (G78) and a second extended version (G8). Conditions. Prerecorded media where a separate audio track or version can be offered. Method. G78: a second, user-selectable audio track adds descriptions during pauses in dialogue and sound effects, so that new information neither obscures key audio nor is obscured by loud effects. G8 states the cost: narrators sometimes must fit a lot of information into very short pauses; extended description removes that squeeze. G78 test: check that gaps in dialogue are used to convey important visual information. Failure modes. Squeezing key description into short pauses on the standard track; or obscuring effects. Limitations. G78 gives no durations; relation to the F113 usability test is in C3-B797-01. Version/date. WCAG 2.2 technique pages as fetched.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: Technique pages are sufficient-technique advice, not requirements; no numerical limits. DCMP Description Key (HTTP 403 to curl) and the ACB ADP guideline pages (404 at tried URLs) could not be fetched, so no DCMP/ACB gap-timing rule is claimed here; only W3C WCAG 2.2 pages were read.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.w3.org/WAI/WCAG22/Techniques/general/G78","note":"Description; Tests; Description"},{"url":"https://www.w3.org/WAI/WCAG22/Techniques/general/G8","note":"Description; Tests; Description"}]},"categories":["T10","T13"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://www.w3.org/WAI/WCAG22/Techniques/general/G78","claim":"Problem. Choosing between a standard description track (G78) and a second extended version (G8). Conditions. 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Choosing between a standard description track (G78) and a second extended version (G8). Conditions. Prerecorded media where a separate audio track or version can be offered. Method. G78: a second, user-selectable audio track adds descriptions during pauses in dialogue and sound effects, so that new information neither obscures key audio nor is obscured by loud effects. G8 states the cost: narrators sometimes must fit a lot of information into very short pauses; extended description removes that squeeze. G78 test: check that gaps in dialogue are used to convey important visual information. Failure modes. Squeezing key description into short pauses on the standard track; or obscuring effects. Limitations. G78 gives no durations; relation to the F113 usability test is in C3-B797-01. Version/date. WCAG 2.2 technique pages as fetched.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: Technique pages are sufficient-technique advice, not requirements; no numerical limits. DCMP Description Key (HTTP 403 to curl) and the ACB ADP guideline pages (404 at tried URLs) could not be fetched, so no DCMP/ACB gap-timing rule is claimed here; only W3C WCAG 2.2 pages were read.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.w3.org/WAI/WCAG22/Techniques/general/G78","note":"Description; Tests; Description"},{"url":"https://www.w3.org/WAI/WCAG22/Techniques/general/G8","note":"Description; Tests; Description"}]},"tags":[],"type":"article","links":[],"title":"What limit does WCAG state on how much a standard, user-selectable AD track can carry compared with an extended version?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Problem. Choosing between a standard description track (G78) and a second extended version (G8). Conditions. Prerecorded media where a separate audio track or version can be offered. Method. G78: a second, user-selectable audio track adds descriptions during pauses in dialogue and sound effects, so that new information neither obscures key audio nor is obscured by loud effects. G8 states the cost: narrators sometimes must fit a lot of information into very short pauses; extended description removes that squeeze. G78 test: check that gaps in dialogue are used to convey important visual information. Failure modes. Squeezing key description into short pauses on the standard track; or obscuring effects. Limitations. G78 gives no durations; relation to the F113 usability test is in C3-B797-01. Version/date. WCAG 2.2 technique pages as fetched.","evidence":{"claims":[{"url":"https://www.w3.org/WAI/WCAG22/Techniques/general/G78","claim":"Problem. 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