Use the HTML 4.01 Transitional doctype without a URL to force quirks mode on all browsers
Use the HTML 4.01 Strict doctype to force strict on all browser except IE6 and IE7, which use almost standards mode
In the W3C box model, element width excludes padding and borders
In the IE quirks mode box model, element width includes padding and borders, giving extra spacing between containers, but IE6 and later use the W3C box model when in standards compliant mode
Design markup so that fixed width elements that need padding or borders have width set on the container, and borders and padding set on the content element to avoid issues in IE quirks mode with the border box model
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