The value specifies the URL for the image to be loaded from (at present must be loaded from a publicly accessible location).
Attached to this node can be (optionally)
The value within a Size node specifies the pixel (px) size height and width separated by a colon.
The Show value can specify a variable name, and whether to start hidden (false) or shown (true), the values of true and false are case insensitive. The variable of that name will be watched and when changes, the value attached will be processed to show or hide the image as stated in the prior statement.
Th value of the Alt node specifies the alternate text for the the image.
An example is shown below:

Further styling may be applied by the use of CSS as required within the limits allowed by specific of the browsers.