Function getElementByCSS

V2ex-Enhanced.user.js:548–550

(css, contextNode = document)

        },
    };
    function getElementByCSS(css, contextNode = document) {
        return contextNode.querySelector(css);
    }
    function getAllElementsByCSS(css, contextNode = document) {
        return [].slice.call(contextNode.querySelectorAll(css));
    }