Support compatibility with RequireJS

I want to use [RequireJS](https://requirejs.org/docs/api.html#cjsmodule) in my project so I can modularize my HTML/Javascript projects and allow my colleagues to view them by clicking on a file. (ES6 modules are not possible to use because of CORS with `file://` URLs)

KaTeX appears to be incompatible with RequireJS because it assumes certain semantics about "define" and "require" which appear to be from CommonJS.

Is there a way to make KaTeX compatible with RequireJS?

No source file or test is named in the issue. Start by reproducing KaTeX loading through RequireJS from a file:// URL, then trace the module-loading entry points involved; done means KaTeX loads and renders correctly under RequireJS without breaking its existing loading modes.

Written by the indexing model from the issue text.