FA-78175 / Subtitle cue timing / Member archive

WebVTT cue timing line parsing: fraction format · case 05

Timestamps with truncated fractions such as 00:01.5 are accepted as 5 ms.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Parse "START --> END [settings...]" (whitespace separated). Timestamps are [hh:]mm:ss.ttt with hours of two or more digits, minutes and seconds exactly two digits below 60, and exactly three fraction digits after a period. END must be after START. Return [start_ms,end_ms,settings joined by single spaces] or None.

Why this case matters

Subtitle timing defects shift, hide or overlap captions that viewers depend on for comprehension and accessibility.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: fraction format	`[60005, 360000000, ""]`	`null`	Failed

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