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In some browsers, like firefox, the document type XHTML 1.0 Transitional will not activate the Standard mode as used by XHTML 1.0 Strict, but instead an "Almost Standard" mode.

One of the important differences is the handling of images inside tables. If an img-element is used inside a td-element, in the strict mode, the bottom of the image is align with the baseline for text, and hence the rendering adds some space for the part of the letters that would be underneath that baseline (i.e. g or y). This means the rendered box has additional space underneath the image.

In the "Almost Standard" mode, this additional space is not added, hence allowing the images to be flush .

The trick in Standard mode is to change the display mode for the img-element from inline to block. In this way the rendering is equal to the one in "Almost Standard" mode.