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Why no one is seeing anything
The reason it doesn't show up in some browsers is that some browsers skip over rendering table datum (<td>...</td>) elements if they are empty. One common solution if you need an empty table cell that just takes up space and contains a colored background is to put a nonbraking space inside, like this:
<td> </td>
By the way, with a program like this you might try implementing a GIF-style lossless compression scheme, whereby if you have several identical adjacent pixels you represent it as a single <td>...</td> with the width attribute greater than 1.
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