.js-ajax-cart-not-compatible
Liquid Ajax Cart adds the js-ajax-cart-not-compatible CSS class to the body tag if the current browser doesn’t support all the features needed for Liquid Ajax Cart.
To run Liquid Ajax Cart a browser must support fetch, Promise, FormData, WeakMap, DOMParser, template strings, destructuring assignment.
The function that checks browser compatibility is called isCompatible and it is located in the index.ts file.