This was was cloned from bug 16915 as part of operation convergence.
Originally filed: 2012-05-03 09:22:00 +0000

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 #0   contributor@whatwg.org                          2012-05-03 09:22:39 +0000 
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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html
Multipage: http://www.whatwg.org/C#texttrackcue
Complete: http://www.whatwg.org/c#texttrackcue

Comment:
The DOM API should be able to read and set the "auto" value for
TextTrackCue.line

Posted from: 88.131.66.80 by simonp@opera.com
User agent: Opera/9.80 (Macintosh; Intel Mac OS X 10.7.3; U; en) Presto/2.10.229 Version/11.62
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 #1   Simon Pieters                                   2012-05-03 09:25:35 +0000 
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I think the current situation is not optimal -- it's not possible to tell if a cue has position 0 or auto, and if you want to change the position to auto, you have to create a new cue and copy over all other properties.

I think the IDL should be something like

enum LinePositionKeyword { "auto" };
...
           attribute (long or LinePositionKeyword) line;
...

and then prose handling "auto" as appropriate.
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 #2   Simon Pieters                                   2012-05-03 09:30:22 +0000 
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Also currently the following line makes the cue change position from the bottom to the top, which seems weird:

cue.line = cue.line;
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