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Increasing the font size should work on most browsers without increasing the size of the screen dimensions of the containing items. This is not without a penalty: the layout suffers. However, data tables often expand pro rata.
Tabbing generally starts at top-left and continues left to right, top to bottom, except that...
...if you want the page content, unadorned by the header, menus, etc, there is a button at the bottom of the left column or in the footer (access key = C, tab index = 0) which opens a new page containing the stripped down content. This has most of the redundant formatting removed. Unfortunately, there is an error in Microsoft's IIS which prevents some of the redundant formatting from being removed.
You can return to the page you came from via a link at the top of the page.
Some of the page formatting uses tables; these tables generally have a summary which indicates their formatting purpose.
At the end of an unadorned content page is a footer. At the end of the real content and before the footer is a statement stating 'end of content'.