First cut of descriptions for style attributes.

[td2d3@techinfo.mod.uk]

Background color is the color rendering surface to which all elements cover, 
the entire default canvas will be white.  A set value of #000000 will 
display a black background for all elements to render over.  Need examples?

Character height is the height of a character from the base line position 
together with the text-font white space between lines of text.  The use of 
this style attribute value will increase or decrease the displayed character 
size by the value stated.  Need examples?

Fill color is the style attribute applied to a closed area inside the path 
of a shape. For example, if you draw a shape with a closed path, the fill 
color attribute will color the closed area.  Need examples?

Stroke-color: In illustration, drawn lines are the strokes of a pen.  The 
stroke-color is the applied color of the pen stroke for that line's 
presentation.  This style attribute will apply an absolute or a relative 
intensity color change to the current color line value. 

Stroke-weight: The stroke-weight determines the thickness of the pen strokes 
for that line's presentation.  The stroke-weight is centered on a drawn line 
of the path.  This stroke-weight attribute will apply an absolute or a 
relative scale change to the current line value. 

Text-color is the applied fill to text-font in the 'WebCGMString', the 
default fill text-color is black.  This style attribute will apply an 
absolute or a relative intensity color change to the current color in the 
text string value. 

Text-font attribute names the set of type characters and their specific size 
and style of type within a type family in 'WebCGMString'.  Example 
<Helvetica> <plain> <bold>.

Raster intensity is the strength of which an image is visible and the 
strength of color or levels of grays that are displayed. The default relative 
intensity would be 100%.