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Bug 28236 - The "rules for updating the text track rendering" are not run when mode changes from hidden to showing
Summary: The "rules for updating the text track rendering" are not run when mode chang...
Status: RESOLVED MOVED
Alias: None
Product: WHATWG
Classification: Unclassified
Component: HTML (show other bugs)
Version: unspecified
Hardware: Other All
: P3 normal
Target Milestone: Unsorted
Assignee: Ian 'Hixie' Hickson
QA Contact: contributor
URL: https://html.spec.whatwg.org/#media-p...
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-03-19 06:06 UTC by contributor
Modified: 2019-03-29 21:35 UTC (History)
4 users (show)

See Also:

Attachments

Description contributor 2015-03-19 06:06:47 UTC 
Specification: https://html.spec.whatwg.org/
Multipage: https://html.spec.whatwg.org/multipage/#media-playback
Complete: https://html.spec.whatwg.org/#media-playback
Referrer: 

Comment:
The "rules for updating the text track rendering" are not run when mode
changes from hidden to showing

Posted from: 14.162.102.1
User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.76 Safari/537.36 OPR/28.0.1750.40
Comment 1 Philip Jägenstedt 2015-03-19 06:10:03 UTC 
The "time marches on" algorithm runs the "rules for updating the text track rendering" only for "affected tracks", i.e. tracks where the the active cues have changed. This misses cues in tracks that have gone from hidden to showing. Per spec, those cues would only become visible when another cue in the same track changes its active state.

This has been worked around in Blink by also running the "rules for updating the text track rendering" when a track goes from hidden to showing. It could possibly be spec'd as part of the "time marches on" algorithm, but that would only work because the idea is that this algorithm is run all the time, where in an implementation you would only run it when you have reason to think that any cues have changed their active state.
Comment 2 Domenic Denicola 2019-03-29 21:35:18 UTC 
https://github.com/whatwg/html/issues/4486