JAVASCRIPT

remove element by class

function removeElementsByClass(className){
    var elements = document.getElementsByClassName(className);
    while(elements.length > 0){
        elements[0].parentNode.removeChild(elements[0]);
    }
}

getelementsbyclassname remove class

var elems = document.querySelectorAll(".widget.hover");

[].forEach.call(elems, function(el) {
    el.classList.remove("hover");
});