[webvtt] Pull Request: Actually throw IndexSizeError for out-of-range values in VTTRegion

zcorpan has just submitted a new pull request for 
https://github.com/w3c/webvtt:

== Actually throw IndexSizeError for out-of-range values in VTTRegion 
==
Fixes #329.

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Thanks @BenjaminSchaaf 

See https://github.com/w3c/webvtt/pull/331

Received on Tuesday, 21 February 2017 12:11:39 UTC