As its name says, this adapter handles whatever concerns the parsing, the tokenization and hence the conversion of a WebVTT text track so that it can be used by @sub37/*.
It tries to adhere as much as possible to the standard, leaving out or manipulating some concepts regarding the rendering of cues (which must be accomplished along with @sub37/captions-renderer).
Here below a list of features that other platforms do not or partially support:
- Timestamps to show timed text within the same cue (right now this is not supported by browsers even if part of the standard);
- Regions (not very well supported by Firefox, but supported in Chromium);
- Positioning attributes (like
position: 30%,line-left, supported by Firefox but not supported by Chromium);
lines: as one of the core principles of@sub37/captions-rendereris to collect everything into regions, the line amount is to be intended of how many lines the region will show before hiding older lines;snapToLines: this is not supported, cause oflines::past / ::future: not yet supported. Might require deep changes, but they haven't been evaluated yet;::cue-region: as above;- Vertical text support is missing yet. Will be introduced soon, as it requires changes also into
@sub37/captions-renderer. - Default CSS Properties are not supported as they are matter of
@sub37/captions-renderer; - Time-aligned metadata cues are not supported yet.