Update:

Please don't use the DOMSubtreeModified event. It is old, deprecated and not well-supported by browsers. In 99,9 % of the cases, there is a different event you can listen on. Most likely you are one of those people using jQuery and doing some AJAX stuff, so please take a look at their AJAX docs.

These are all available events. You would have to detect $(document).bind('DOMSubtreeModified', function() { ... }); and check for a dimension change to the previous firing.

var height = $(this).height(),

    width  = $(this).width();

$(document).bind('DOMSubtreeModified', function() {

    if($(this).height() != height || $(this).width() != width) {

        recalibrate();

    }

});

This event is firing every time anything is done to the DOM. Therefore it will slowdown your browser.

We should get a better alternative. Could you please give us more information to your scenario?