I have Adobe Flash security autorisation for some folders where I put my current work. It is not a problem. Everything works fine and I can test separately the same code with Flash or with HTML5.
If I complete the plugin textfield with global onclick="openurl(http://.....,_self); it works very well.
The only problem is that I can not open with iPad (HTML5) another website by clicking one selected word (or a groupe of words) in the text body of the textfield. It must be possible, because I have show me your example.