Useful JS snippet for finding DOM elements wider than current viewport. Only tested in Chrome.

find-wide-dom-elements.js

var els  = document.querySelectorAll('*');
var l = els.length;
var maxWidth = window.innerWidth;
console.log('Elements wider than ' + maxWidth);
for(var i  = 0 ; i < l; i ++){
    var e = els[i];
    var width =e.offsetWidth;
    rect = e.getBoundingClientRect();
    
    if(rect.width > maxWidth){
        var cssWidth =  window.getComputedStyle(e, null).getPropertyValue("width");
        console.log(width, cssWidth,e);
    }
}
console.log("-------------\n");