Rich tooltip feature enables the user to see tooltips with images and formatted text on an edit field. This feature also enables the developer to specify the delay time after hovering before it displays the tooltip message. The information of the tooltip has to be available on the web page. To display a rich tooltip on an edit field, you will need to set the control name of the fields like as follows.
<controlname>:<attachpoint>:tooltipfields=<fields control name where you extract the information from separated by comma>:showdelay=<in millisecond>:default
For example:
ProductName:MainArea:tooltipfields=ProductCode,ProductDescription,ProductImage:showdelay=400:default