wintercounter

<img src="large-default-file.jpg">
    <source src="smaller.jpg" media="max-width:600px">
    <source src="tiny.jpg" media="max-width:320px">
</img>

wintercounter

/* focusin/out event polyfill (firefox) */
!function(){
    var w = window, 
        d = w.document;

    if( w.onfocusin === undefined ){
        d.addEventListener('focus'    ,addPolyfill    ,true);
        d.addEventListener('blur'     ,addPolyfill    ,true);
        d.addEventListener('focusin'  ,removePolyfill ,true);
        d.addEventListener('focusout' ,removePolyfill ,true);