Function getAllElementsByCSS

V2ex-Enhanced.user.js:551–553

(css, contextNode = document)

        return contextNode.querySelector(css);
    }
    function getAllElementsByCSS(css, contextNode = document) {
        return [].slice.call(contextNode.querySelectorAll(css));
    }
    function getElementByXpath(xpath, contextNode, doc = document) {
        contextNode = contextNode || doc;
        try {