YOUTUBE ZfytHvgHybA Bret Victor - Stop Drawing Dead Fish
See Lepiter.
Transcript Lepiter - Use Custom Page View Model github 
> […] check out the [Quote Me](https://github.com/SeanDeNigris/Quote-Me) project's {{gtClass:QuLeTranscriptPageElement}} for a real world example.
YOUTUBE BFT5jwFtm1c GToolkit Lepiter - Custom Page Types
Sean DeNigris > I finally have a generic working mechanism to simulate custom page types. I say simulate because this functionality goes beyond the flexibility currently offered by Lepiter, so is a bit of a hack underneath. That said, here you can see an example of a Lepiter Transcript Page with a custom element including a player. Note that clicking on the time in a snippet seeks the video to that time.