Here are my definitions, which are not based on any "official" source:
Page (or Web Page)
The HTML page, which unlike print, does not have a definitive depth (or,
The viewable part of the HTML page, greatly affected by monitor size and
The browser window, which may be set larger or smaller than the actual HTML
page width. Pop-up windows would be a sub-set of this category.
The pop-up/down/out menus. I would use the full term to eliminate confusion,
since many browsers now use tabs to display multiple web pages.
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