it doesn't depend on anything other than the size and resolution of the
visitor's browser.
either people build their sites at a % width using .css or tables, or both.
Or they build them at a fixed width in px. Most of the time it's around
750px wide so there's no scroll in 800px wide monitors.
HTH
--
Chris Leeds,
Microsoft MVP-FrontPage
Make More Money With Less Work
AND Blow Your Clients Minds! http://contentseed.com/
sorry if my answer is cliched, however that is like asking "how long is a piece
of string?" The answer is "it all depends".
Pixels are the "dots of light" that make up an image on the screen and have
nothing to do with the size of web sites, which comes to the next point - what
makes a standard web site standard?
You can find out the megabyte size, but right-clicking the folder their site is
in and selecting properties and it will show the total mega-byte size of all
files - this gives you a rough idea.
Maybe I'm on the wrong track here and I'm sorry if I misunderstood your question.
Perhaps you meant to ask:
"What is the most common resolution people generally view web sites at?"
This is a user's choice but
800 x 600 and 1024 x 768 are by far the most "common" in general terms. But
everything depends on the user's system and their set-up.
And, of course, resolution has nothing (or very little) of concern to a web
developer, since it only determined the maximum width/height of your browser
viewport. Those are the dimensions you need to be concerned with. On my
1280 screen, my browser is seldom wider than about 720 pixels.