HTMLElement SetHidden Method
Adds or removes the Abacus hidden class from an element.
R←I SetHidden B
This is an APLDOM to browser DOM synchronized method.
I is the HTMLElement instance. B is a scalar Boolean, 1 or 0. R is 0.
The hidden class sets the display property to "none". This takes the element out of flow and may alter the layout.
To make an element invisble without altering the rest of the layout, use the SetInvisible method.