[foms] WebVTT usage and other video stats

[Silvia Pfeiffer]

The 2019 media formats report is out with some very interesting insights.

<
https://1yy04i3k9fyt3vqjsf2mv610yvm-wpengine.netdna-ssl.com/files/2019-Global-Media-Formats-Report.pdf?fbclid=IwAR2AE9uiCxFAq1dzGwZipY3naPTzHwK0U0DqUXZaLipY-LxTDIHRivjQjV8
>


I'd particularly like to point out the more than 30% usage of WebVTT for
captions and that WebVTT it's just about to become a full blown w3c
recommendation.

https://www.w3.org/TR/webvtt1/

It will be so important to have all implementations become fully
interoperable, particularly the web browsers.

The following features are at-risk, and may be dropped during the CR period
of there's not at least 2 interoperable implementations:

   - collision avoidance with snap-to-lines false
   <https://www.w3.org/TR/webvtt1/#collision-avoidance>
   - ::cue-region pseudo-element
   <https://www.w3.org/TR/webvtt1/#the-cue-region-pseudo-element>
   - :past and :future pseudo-classes
   <https://www.w3.org/TR/webvtt1/#the-past-and-future-pseudo-classes>


The current status of implementations is tracked here:
https://docs.google.com/spreadsheets/d/e/2PACX-1vSHzJtwi_2ijdV7hRUH0Fe8qZeSwMaCLErK7w7U_IFzhzNmW9YwPRWrER1eHR9-4Eo0kqyXJ4G35b1b/pubhtml

And in automated tests here:
https://github.com/web-platform-tests/wpt/tree/master/webvtt

Cheers,
Silvia.
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