Nigel Megitt

For information, w3c/ttml1#353 is in a holding pattern pending any clear agreement on how W3 is going to handle this. It's clear already from https://github.com/tobie/specref/issues/463#issuecomment-385781680 that using a subtitle in...

Thanks @tobie that's useful information. I had the impression from @plehegar that possibly specref would not be changed at all and the only change would be in backend W3 systems.

+1 to resubmitting this - ratifying through IETF would allow external open standards to reference it.

Perhaps the request should be that, in the absence of finer granularity queries, `@supports` should return `false` unless the implementation support exists in _all_ usage contexts.

An additional use case for this feature is described at https://github.com/w3c/imsc/issues/484#issuecomment-519169604 and further up that thread in more wordy fashion.

> > What I can say is that TTMLs of newer videos from the same source are in a different format (and work with ttconv out of the box), so...

Interesting. I'm fairly certain that I didn't test what would happen with `textCombine` when we submitted this code. Thanks for catching this. On first glance we should only need the...

I'm interested in this working consistently too - this difference in behaviour is really awkward, though I can appreciate it's hard to fix. Even the two examples in https://github.com/sandflow/imscJS/issues/74#issuecomment-361955415 look...

Ah, shame, I don't know how to do this, but it looks like other people would like something similar too! I see that Firefox now has built-in 'Take a screenshot'...

Not supporting `writing-mode` could be a bit of a blocker!