For ABCChrome and MSHtml engines
This property determines or reflects the virtual browser width when
HTML documents do not have a predefined width and height. The
width of an HTML document varies as the client resizes the browser.
How far the content flows down the page is dependent on the width
of the browser.
The Width parameter is used to control this aspect of HTML
rendering. It is exactly as if you were displaying your HTML in a
browser window the same width as the supplied value. Typical values
might be 800 or 1024.
If the Width is zero then the web page view will default to a
size which shows all the available content without needing to
scroll from left to right. You can use this default to ensure that
all your HTML content is visible.
When the Width is zero the InitialWidth property is used as a minimum
sensible width. The page may get wider to ensure that content is
not clipped, however it will not get smaller than this value.
For Gecko engine
This value determines the paper width, in pixels, to use while
doing layout in Gecko.
Since the Gecko engine always renders in a paginated context and
never needs to scroll, contents that horizontally exceed this value
will often be reflown vertically.
For example, a sidebar using the CSS float property may appear
below the "main content area" if the paper is not wide enough to
accommodate both items.
If the value is zero then the paper width will be determined
using the dimensions of the current Doc.Rect.