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Follow-up to https://www.w3.org/Bugs/Public/show_bug.cgi?id=19836 While the parser cannot create a cue with non-integer line and the snap-to-lines flag set to true, scripts can. This must be handled in http://dev.w3.org/html5/webvtt/#dfn-text-track-cue-computed-line-position
Fixed in https://github.com/w3c/webvtt/pull/25