[Webkit-unassigned] [Bug 168715] New: Implement WebVTT VTTCue lineAlign and positionAlign attributes
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Feb 22 03:08:57 PST 2017
https://bugs.webkit.org/show_bug.cgi?id=168715
Bug ID: 168715
Summary: Implement WebVTT VTTCue lineAlign and positionAlign
attributes
Classification: Unclassified
Product: WebKit
Version: Safari Technology Preview
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: Media Elements
Assignee: webkit-unassigned at lists.webkit.org
Reporter: zcorpan at gmail.com
VTTCue.lineAlign and VTTCue.positionAlign are not supported.
In the WebVTT syntax these are specified after a "," in position and line settings.
Spec:
http://w3c.github.io/webvtt/#webvtt-cue-position-alignment
http://w3c.github.io/webvtt/#webvtt-cue-line-alignment
http://w3c.github.io/webvtt/#parse-the-webvtt-cue-settings
http://w3c.github.io/webvtt/#the-vttcue-interface
Tests:
http://w3c-test.org/webvtt/api/VTTCue/lineAlign.html
http://w3c-test.org/webvtt/api/VTTCue/positionAlign.html
These are supported in Gecko. Bug for Chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=633690
I think the use case is basically better control in positioning things.
See http://w3c.github.io/webvtt/#example-0c2976c9 for an example.
00:00:00.000 --> 00:00:04.000 position:10%,line-left align:left size:35%
Where did he go?
Without position-align you need to set position to some value that doesn't correspond to what the author actually intends:
00:00:00.000 --> 00:00:04.000 position:27.5% align:left size:35%
Where did he go?
27.5% here is: intended position (10%) + size/2 (35%/2). Not intuitive.
Having this also makes the mapping from other subtitle formats to WebVTT (and back) more straightforward.
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