Netscape 4.x error condition bug: if a BGCOLOR and BACKGROUND
attribute have been specified for the cell, and the URL to the image fails to load,
the bgcolor should be used instead. Netscape 4.x does that for a moment, but then
this changes to a block only the size of the broken image placeholder with the
specified BGCOLOR in the upper, left corner of the cell.

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TD Cell 1 TD Cell 1 TD Cell 1 TD Cell 1 |
TH Cell 2 TH Cell 2 TH Cell 2 TH Cell 2 |
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TH Cell 3 TH Cell 3 TH Cell 3 TH Cell 3 |
TD Cell 4 TD Cell 4 TD Cell 4 TD Cell 4 |

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TD Cell 1 TD Cell 1 TD Cell 1 TD Cell 1 |
TH Cell 2 TH Cell 2 TH Cell 2 TH Cell 2 |
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TH Cell 3 TH Cell 3 TH Cell 3 TH Cell 3 |
TD Cell 4 TD Cell 4 TD Cell 4 TD Cell 4 |

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TD Cell 1 TD Cell 1 TD Cell 1 TD Cell 1 |
TH Cell 2 TH Cell 2 TH Cell 2 TH Cell 2 |
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TH Cell 3 TH Cell 3 TH Cell 3 TH Cell 3 |
TD Cell 4 TD Cell 4 TD Cell 4 TD Cell 4 |

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TD Cell 1 TD Cell 1 TD Cell 1 TD Cell 1 |
TH Cell 2 TH Cell 2 TH Cell 2 TH Cell 2 |
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TH Cell 3 TH Cell 3 TH Cell 3 TH Cell 3 |
TD Cell 4 TD Cell 4 TD Cell 4 TD Cell 4 |

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TD Cell 1 TD Cell 1 TD Cell 1 TD Cell 1 |
TH Cell 2 TH Cell 2 TH Cell 2 TH Cell 2 |
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TH Cell 3 TH Cell 3 TH Cell 3 TH Cell 3 |
TD Cell 4 TD Cell 4 TD Cell 4 TD Cell 4 |