html2canvas/src/textcontainer.js

function TextContainer(node, parent) {
    NodeContainer.call(this, node, parent);
}

TextContainer.prototype = Object.create(NodeContainer.prototype);

TextContainer.prototype.applyTextTransform = function() {
    this.node.data = this.transform(this.parent.css("textTransform"));
};

TextContainer.prototype.transform = function(transform) {
    var text = this.node.data;
    switch(transform){
        case "lowercase":
            return text.toLowerCase();
        case "capitalize":
            return text.replace(/(^|\s|:|-|\(|\))([a-z])/g, capitalize);
        case "uppercase":
            return text.toUpperCase();
        default:
            return text;
    }
};

function capitalize(m, p1, p2) {
    if (m.length > 0) {
        return p1 + p2.toUpperCase();
    }
}