Out of curiosity, I just downloaded the following page and tested it in current versions of Chrome, Firefox, Safari, and IE9. In all but IE9, I was greeted by a message alert(). IE9 did not warn me and contained two errors in the console. Here's the code I used with the Zepto library in the same folder.
<!doctype html>
<h1>Zepto Browser Support Test</h1>
<script src="zepto.min.js"></script>
<script>
$(function () {
alert('Zepto Ready Successful!');
});
</script>
, , -, IE9, , Zepto .
, Zepto , IE, - jQuery. .
Internet Explorer, jQuery. , , IE 10, document.write:
<script>
document.write('<script src=' +
('__proto__' in {} ? 'zepto' : 'jquery') +
'.js><\/script>')
</script>
Zepto docs .
, !