Thank you very much for your contribution.

1. The post is well written and descriptive.
2. The timelineGL.js as I understand, you are modifying on somebody else' code, it would be nice to have a list of changes in the header comment.
3. for(i = 1; i <= tracks; i++) { a code smell that you forgot to put var or let, which could make i a global variable , same as the variable a in line 737 which is just bad.
4. new Array() could be shortened as [];
5. commented-out code in general is not a good idea, you 'd better just remove them.
6. Congratulations, you have introduced Javascript in this repro, could we unit test the changes you've made?

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