Rich Text Syntax
A rich text is a string using a subset of the HTML format.
The following HMTL markups are allowed:
<p> <br> <a> <font>
<b> <i> <s> <sub> <sup> <small> <tt> <u>
<h1> <h2> <h3> <h4> <h5> <h6>
 
The 
<font> markup understands the following attributes:
face, 
color, and 
size.
The 
size attribute can be:
  - 
A value between 
1 and 7 for an absolute font size.
 
  - 
-1 for a smaller font size.
 
  - 
+1 for a larger font size.
 
  
Any HTML entity can be used.
Line breaks using CR or LF are not converted so 
<br> (linebreak) or 
<p> ... </p> (paragraph) must be used.
No CSS style can be used.
Rich text is mainly used by 
TextLabel, 
GridView cells, the 
Paint.DrawRichText and other rich text methods and properties.
Warning:
RichText display is handled by the toolkit and support for other HTML tags varies.
For example with QT you can also create a 
<table> and use lists 
<ul>, 
<ol>, etc. but with GTK you can not.
If you want to use tables or lists in your RichText then you will have to make a QT only program.
If your program uses gb.gui so can be either QT or GTK then you should make sure it works on both toolkits if you are using other tags.