99problems
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ADE and Nook allow borders to overrun floated image
On Nook and ADE, if you have a floated element next to running text that has borders, the text will flow around the floated element but the border will not

Although no other reading system does this, technically it may not be a bug (see http://www.smashingmagazine.com/2007/05/01/css-float-theory-things-you-should-know/)
Fix is to float the text as well, if feasible, or to replace border with an < hr>
better, less invasive fix for a right-floated image: specify a max-width: 100%-(width-of-image+padding) on the element with the border