While there are a lot of links to "getting started" with Visualize.js, they all seem to point to some Youtube videos. Is there any written documentation for Visualize.js? You can't really search for a specific word or phrase in a video.
There's a "Docs" link to the right of the "Answers' link that takes you to all the formal documentation:
The visualize.js guide is available in PDF here:
and in html here: