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Use cases for timed tracks rendered over video by the UA

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This page contains examples of features where timed tracks are rendered over video by user agents natively.

Return to timed tracks home page.

Static Examples

These are categorised by what features they demonstrate that is most interesting.


This example shows how multiple segments with overlapping times should be automatically placed so as to not overlap: http://www.youtube.com/watch?v=xG9KluukpJI#t=2m40

This example shows that we need line-based positioning: http://www.youtube.com/watch?v=bw5JBWdaUHI#t=0m12s

This example shows a case where animated positioning and angular change are highly recommended to achieve a desired style: http://www.youtube.com/watch?v=Qz2F-H7IHFM


Italics or other inline emphasis

italics and blod used together


Multiple voices

Karaoke with color coded voice, where parts sung together have a unique color (source):

Important line feeds

Plain text

Background emphasis

This is from a mobile phone and needs particular contrast and visibility.

Multiple colors

Colors are often used in closing comments to signify the author of the captions.

Legal notices



Formal documentation for real-world captioning

  • CBC captioning manual requires:
    • minor control over position
    • word-level italics control
    • frame-level timing

Video Examples

See http://www.dcmp.org/captioningkey/types_methods_styles.html and the pages following this one (click on the next topic at the bottom)

This is now at http://www.dcmp.org/captioningkey/text.html