@sub37/webvtt-adapter

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).

Supported features

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);

Manipulated concepts or missing features

• lines: as one of the core principles of @sub37/captions-renderer is 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 of lines
• ::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.