Bookmarklet that replaces all fonts with “Hiragino Kaku Gothic Pro” on current webpage

replace-fonts-bookmarklet.js

/*
 * Pack below script via http://jscompress.com/ to generate bookmarklet
 */
(function(rootNode, fontFamily) {
    var hasChildTextNode = function(parentNode) {
        return [].some.call(parentNode.childNodes, function(node) {
            if (node.nodeType == Node.TEXT_NODE) {
                console.log(node.nodeValue);
            }
            return node.nodeType == Node.TEXT_NODE;
        });
    };

    var OverrideFontFamilyRecursively = function(parentNode) {
        var childNodes = parentNode.childNodes;
        [].forEach.call(childNodes, function(node, index) {
            switch (node.nodeType) {
            case Node.ELEMENT_NODE:
                if (hasChildTextNode(node)) {
                    node.style.fontFamily = fontFamily + " " + node.style.fontFamily;
                    node.style.webkitFontSmoothing = "subpixel-antialiased";
                }
                OverrideFontFamilyRecursively(node);
                break;
            }
        });
    };
    OverrideFontFamilyRecursively(rootNode);
})(document.body, "Hiragino Kaku Gothic Pro");