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A problem with UE4 HTML5

Hi everyone, i have a problem with viewing a web page widget in HTML5 uploaded on google chrome.
In application UE4 it works, when i press the button on a Plane it loads the website in the widget and I can navigate it.
while when I try it on google chrome exported to html5, when I press the button it cannot load the widget showing me only a black Plane.
What could it be?

sorry for my little experience in explaining the program but I have just started studying it.
thanks for who will reply.