typekit-onload.js

Typekit.load({async:true,active:function() {
    Array.prototype.some.call(document.head.children, function (node) {
        if (node.tagName === 'STYLE' && node.innerHTML.indexOf('typekit.net') > -1 && node.innerHTML.indexOf('@font-face') > -1) {
            window.localStorage.setItem('ts.fontFace', node.innerHTML);
            return true;
        }
        return false;
    });
}});