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<html>
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<head>
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<style>
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th, td { background: #ddd; }
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table { border-collapse: collapse; }
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</style>
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</head>
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<body>
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<table border="1">
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<tr><th>x</th><th colspan="2" class="a1 a2">A</th></tr>
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<tr><th>x</th><td class="a1">a1</td><td class="a2">a2</td></tr>
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</table>
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</body>
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</html> |