Popup Window in Header

I would like to make the ? in the header interactive where the user clicks on it and a pop up window appears (but not a new browser window or an alert, just like a notification window).

orders.setText('Non-Uploaded & Escrow Orders <span style="font-size:18px;"><a class="question" href="javascript:window.Open();"><i class="fa fa-question-circle"></i></a></span>');

Is it possible to place a div that can be called in a function?

Or, can I implement the builtin PopUp function within the header?

You can use approach from this sample:
dhtmlx.com/docs/products/dhtmlxP … bject.html
I.s. my demo code and my result


DHTMLX test html,body { width: 100%; height: 100%; margin: 0; }