In iframe i receive this part:
<div style="display:none;height:1px;width:1px;overflow:hidden;"><<img src="qa.offlinx.com/pixel.gif alt="moneris_logo">></div>
But firstly the display property is none and
secondly the image that comes from the address (https://qa.offlinx.com/pixel.gif?program_id=07MBY2L5746BE185&visitor_id=tt15626794810h5O1weYiA) is an image of 1X1 pixel and is not visible easily.
The image is not meant to be displayed, it's used to get the Offlinx info. You can find more info around Offlinx at the following link.
https://www.moneris.com/en/Products-Services/Enterprise/Offlinx