If you’re running Magento and on the product detail page the tabs, for description, tags et cetera aren’t working in IE9 the problem lies in a prototype or IE9 bug. The easiest way of fixing this is changing one line of javascript.
When you open the template file of the tabs, which is catalog/product/view/tabs.phtml, you’ll find a line which says:
ul.getElementsBySelector('li', 'ol').each(function(el){
The solution is to remove the second parameter of this getElementsBySelector method, so the line looks like:
ul.getElementsBySelector('li').each(function(el){
Another solution I found on the internet is adding a meta tag which makes IE9 render the page in IE8 mode. But this is the same as sticking your head in the sand, or putting some buck-tape on a flashing warning light in your car.
