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It's not standards compliant and an all encompassing table has download issues (all elements must be read before any are shown), but it works.
What is allowed to stretch to 100% width is the main table where the content is. Then you'll see your text stretching and wrapping to fit the browser window.
Now the (somewhat) tricky part: The top portion of the page, where you will normally find a banner ad, or slogan, should have a component that is set to 100% width, so that it stretches out a COLORED or blank portion of the page, so that it looks cohesive (the opposite of falling apart).
To do all this well, you will have to use centering for some or all of the content/tables.