There are two
.js files that are included in Petal repository's
Petal.js file that is shipped with Petal is a simply a concatenated file of the two files mentioned above. So in clarification, Petal is jQuery-dependent only if you are planning to use the stock provided JS files. If you are concerned about optimizing dependencies or just don't need jQuery in your project, you are free to exclude the JS files while still using Petal CSS.