For MSHtml engine
This property determines or reflects the virtual browser width
when rendering HTML.
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 640
or 800.
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.
For Gecko engine
This value determines the paper width, in pixels, to
use while doing layout in Gecko. Since the Gecko engine always render
in a paginated context and never needs to scroll, contents that horizontally exceed
this value will often be reflown vertically. For example, a sidebar done using the CSS float
property may appear below the "main content area" because the paper is
not wide enough to accommodate both items. If the value is 0 the paper
width will be determined from the current Rect's dimensions.
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