I would like to see the web pages without its default colors and fonts. It is possible in IE,firefox and opera. Whether I can make it using a style sheet in the space provided in the advanced options of QtWeb? Where I will get such a style sheet or how I can create it? Can I specify my own colors for the visited and un-visited links in a page? Please help.

For the web pages without defined fonts, colors, headers, HTML default values being used.
To customize this behavior,  go to Settings -> Advanced -> Default Style Sheet and type there either URL, or local file path.

For example, this page has no formatting:

    http://www.qtweb.net/tr/translate.htm

Specify Default Style Sheet in settings:

    http://qtweb.net/tr/TestStyles.css

.. and see how web page changed appearance.

Or you can download CSS locally:

   http://qtweb.net/tr/TestStyles.zip

... unpack it, to C: and define default style  as C:\TestStyles.css 


Read Documentation on HTML standard on how to create CSS styles. You can edit them in any text editor, like Notepad.exe