VRML 2.0 browsers were becoming a standard plugin for web browsers back in the late 90s. A vrml browser,,, or more accurately a "plugin" installs into your existing web browser (Netscape or Internet Explorer) and will load a 3D vrml world into your browser window and navigate through that world using a mouse or the control bars usually included with the plugin.

These worlds when written in vrml 2.0 script are text driven. The vrml browser parses that script similar to the way a web browser parses html and turns that script into either a 3 demensional object or world for the viewer to make more sense to just display some basic nodes the same way they could appear in a vrml file:

#VRML V2.0 utf8

# The line above this description is necessary to inform the plugin the
# version of the vrml script it is parsing. All other comments following
# a pound sign will not be read by the plugin but are here only to 
#inform the reader of the script what is happening.
# in html it is equivalent to <!-- something unseen -->
# in c it is equivalent to // in assembly ;


Group {    # all objects begin in a group or a Transform. Case is strict
children        [ # this describes the children in a group or 
                  # transform. The children are parts of the object
                  # that make a whole whether they are a complete world
                  # or just and object.
NavigationInfo {  #this describes the attributes the viewer has in the
                  #world
avatarSize      [
0.25,1.6,0.75 ]  # the viewers size in vrml units
type EXAMINE     # how the vrml browser lets the viewer look at the 
                 # world.
                 # EXAMINE = look at the whole world like an object
                 # WALK =  through the world affected by gravity
                 # FLY = fly unaffected by gravity
                 # NONE = the viewer cannot move through the world
},

DEF default Background { #the DEF key word precedes the name of
                         # any node. In this case it defines the
                         # background node so that it can later be
                         # changed
groundAngle[ 1.2 , 1.42, 1.72]
groundColor[.2 1 1, .61 .1 .8, .7 .2 .4,.8 .3 .5]
skyAngle [1.2,1.32, 1.37, 1.59]
skyColor [.3 1 1,.4 .8 1, .2 1 .9, .8 .6 .5,1 .7 .8]
},#You can also just put in skyColor r g b
    #which will simply change the background color to the values
    #specified in the rgb field,,, the example show a gradiated 
    #sky and ground
Transform{ #only geometry within transforms can be animated or moved
           # to desired locations
translation x y z # this moves the geometry to the x y z coordinate
                    # system which is the same that describes
                    # cartesian space
rotation x y z radian # this will rotate the geometry on the axis you
                      # you select to the radian you specify ie:
                      # rotation 0 1 0 3.14625 will turn the geometry
                      # around 180 degrees on the y axis like a top
scale x y z        # this will change the size of the geometry using
                   # x y z offsets... valid numbers are 0 to infinity
                   # .5 has the same effect as reducing the object
                   # size by 50%
children[
Shape {      #This nodes sets up simple geometry
appearance Appearance{ # this node sets up the appearance of the
                       # preceding geometry
material Material{  # this node discribes the color of that geometry
diffuseColor 1 0 0                    
}
texture imageTexture{ 
url "yourtexture location on the server"
} # the texture node allows you to place bit maps on an object.
  # this works best if the material node is left out.
} #end of the Appearance node...Remember texture and material nodes
  # must be contained in an appearance Appearance node


geometry Sphere{
radius 1
} # the geomtry node allows you to use primitive shapes to create your
  # world. Valid shapes are Cone, Box , Cylinder, Box takes 3
  # values in the size field,,, x  y z, cylinder and cone take a single
  # height and radius value see descriptions below.
  # the sphere

}# this ends the shape node.
] #this ends the children of the transform node
} #this ends the transform
] # this ends the children of the group node
} # this ends the group
// end of example

One important thing to remember that reference to nodes and fields are case sensative, meaning that if the spec shows a capitalized letter and you ommit it, the parser will throw an error. A lot of errors can be traces back to this simple syntactical mistake, as well as to misplaced brackets and DEF discriptions. A Def field can only be used inside of the children bracket of a node,,, or else as a completely new node itself with in the script ie:

Group {
children[]
}
DEF anewgroup{
children[]
}

Primitive Geometry Specifications

Sphere{
radius radius size in units
}

Box{
size x y and z sizes in units
}

Cylinder{
bottom TRUE or FALSE
height size in units
radius radius size in units
side TRUE or FALSE
}

Cone{
bottomRadius radius size in units
height size in units
side TRUE or FALSE
bottom TRUE or FALSE
}