javascript - Zepto - Can't cancel link tap on iPad -

i think must missing obvious, can't use preventdefault cancel navigating link's href when link tapped on ipad (it works ok on android phone though).

i have simple test page, has on:

<a id="mn" href="http://www.google.com">some link</a> <script>     document.write('<script src=js/' +             ('__proto__' in {} ? 'zepto.min' : 'jquery-1.6.2.min') +             '.js><\/script>');      if ('__proto__' in {}) {         document.write('<script src=js/touch.js><\/script>');     }      $(document).ready(             function() {                 $('#mn').tap(function(e) {                     e.preventdefault();                     e.stoppropagation();                 });             }     ); </script> 

the tap event called, if stick alert in there fires ok, action of clicking link never cancelled. missing?!

thanks,

toby