I have a navigation system attached to the top of my page, but if a YouTube video based on an iframe scrolls over it, it displays on top of the navigator (as well as any overlay or modal window-div).
I tried to install a z-index on it, but to no avail.
I found that you can set wmode = "opaque" on the embed object to make it work with the old-style built-in flash memory, but I would prefer to work with HTML 5 and not require specific settings for embedding video
http://jsfiddle.net/EB6gN/9/
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