When you get an answer, please PM me, I am most interested because there have been more question regarding the same problem.
As far as I can see, it is the position: absolute that is created by the JS in the Edge Animate document. When I look at the generated code it looks like
<div class="flow-wrapper" style="width: 1px; height: 326px;"><div style="height: 326px; width: 1359px;" class="center-wrapper"><div style="position: relative; background-color: rgb(255, 255, 255); width: 960px; height: 230px; overflow: hidden; transform-origin: 0px 0px 0px; transform: scale(1.41562);" id="Stage" class="EDGE-378191449"><div class="Stage_Rectangle_id" style="position: absolute; margin: 0px; left: 0px; top: 0px; width: 960px; height: 230px; right: auto; bottom: auto; border: 0px none rgb(0, 0, 0); background-color: rgb(236, 76, 62);" id="Stage_Rectangle"></div><div class="Stage_Text_id" style="position: absolute; margin: 0px; left: 431px; top: 86px; width: auto; height: auto; right: auto; bottom: auto; font-family: Arial,Helvetica,sans-serif; font-size: 50px; color: rgb(207, 207, 207); font-weight: normal; text-decoration: none; white-space: nowrap; opacity: 0.44;" id="Stage_Text">Test</div></div></div></div>