I have an iframe element that contains PDF document the element itself is benaeath a dropdown menu.
|Menu|
<iframe />
it is UI and I can not give you the exact explanation but I believe that you can imagine it. Everytime I click on the "Menu" dropdown a dropdown is generated. No matter that this dropdown has higher z-index attribute it always shows behind the iframe element. This happens in Chrome and IE. I don't know why but it works on Firefox. In other topics I saw that there is a solution if the content was a youtube video but it didn't work for me.