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    copied!<p>Given that <code>&lt;colgroup&gt;</code> is the only semantic method of grouping columns and <code>&lt;tbody&gt;</code> is the only semantic means of grouping rows, I'd recommend sticking with something simple:</p> <pre><code>&lt;table&gt; &lt;colgroup id="colgroup1"&gt; &lt;col id="colA" /&gt; &lt;col id="colB" /&gt; &lt;/colgroup&gt; &lt;colgroup id="colgroup2"&gt; &lt;col id="colC" /&gt; &lt;col id="colD" /&gt; &lt;/colgroup&gt; &lt;tbody id="rowgroup1"&gt; &lt;tr&gt; &lt;th&gt;A&lt;/th&gt; &lt;th&gt;B&lt;/th&gt; &lt;th&gt;C&lt;/th&gt; &lt;th&gt;D&lt;/th&gt; &lt;/tr&gt; &lt;tr id="row1"&gt; &lt;td&gt;A1&lt;/td&gt; &lt;td&gt;B1&lt;/td&gt; &lt;td&gt;C1&lt;/td&gt; &lt;td&gt;D1&lt;/td&gt; &lt;/tr&gt; &lt;tr id="row2"&gt; &lt;td&gt;A2&lt;/td&gt; &lt;td&gt;B2&lt;/td&gt; &lt;td&gt;C2&lt;/td&gt; &lt;td&gt;D2&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;tbody id="rowgroup2"&gt; &lt;tr&gt; &lt;th&gt;A&lt;/th&gt; &lt;th&gt;B&lt;/th&gt; &lt;th&gt;C&lt;/th&gt; &lt;th&gt;D&lt;/th&gt; &lt;/tr&gt; &lt;tr id="row3"&gt; &lt;td&gt;A3&lt;/td&gt; &lt;td&gt;B3&lt;/td&gt; &lt;td&gt;C3&lt;/td&gt; &lt;td&gt;D3&lt;/td&gt; &lt;/tr&gt; &lt;tr id="row4"&gt; &lt;td&gt;A4&lt;/td&gt; &lt;td&gt;B4&lt;/td&gt; &lt;td&gt;C4&lt;/td&gt; &lt;td&gt;D4&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;/table&gt; </code></pre> <p>This will allow you to style quads while still maintaining a clean, semantic structure. I'm not sure how much flexibility you'll have in styling, but you do have some options:</p> <pre><code>&lt;style type="text/css"&gt; table { border-collapse:collapse; font-family:sans-serif; font-size:small; } td, th { border:solid 1px #000; padding:2px 10px; text-align:center; } th { background-color:#000; color:#fff; font-size:x-small; } colgroup { border:solid 3px #000; } tbody { border:solid 3px #000; } &lt;/style&gt; </code></pre> <p><div class="snippet" data-lang="js" data-hide="true" data-console="false" data-babel="false"> <div class="snippet-code snippet-currently-hidden"> <pre class="snippet-code-css lang-css prettyprint-override"><code>table { border-collapse: collapse; font-family: sans-serif; font-size: small; } td, th { border: solid 1px #000; padding: 2px 10px; text-align: center; } th { background-color: #000; color: #fff; font-size: x-small; } colgroup { border: solid 3px #000; } tbody { border: solid 3px #000; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;table&gt; &lt;colgroup id="colgroup1"&gt; &lt;col id="colA" /&gt; &lt;col id="colB" /&gt; &lt;/colgroup&gt; &lt;colgroup id="colgroup2"&gt; &lt;col id="colC" /&gt; &lt;col id="colD" /&gt; &lt;/colgroup&gt; &lt;tbody id="rowgroup1"&gt; &lt;tr&gt; &lt;th&gt;A&lt;/th&gt; &lt;th&gt;B&lt;/th&gt; &lt;th&gt;C&lt;/th&gt; &lt;th&gt;D&lt;/th&gt; &lt;/tr&gt; &lt;tr id="row1"&gt; &lt;td&gt;A1&lt;/td&gt; &lt;td&gt;B1&lt;/td&gt; &lt;td&gt;C1&lt;/td&gt; &lt;td&gt;D1&lt;/td&gt; &lt;/tr&gt; &lt;tr id="row2"&gt; &lt;td&gt;A2&lt;/td&gt; &lt;td&gt;B2&lt;/td&gt; &lt;td&gt;C2&lt;/td&gt; &lt;td&gt;D2&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;tbody id="rowgroup2"&gt; &lt;tr&gt; &lt;th&gt;A&lt;/th&gt; &lt;th&gt;B&lt;/th&gt; &lt;th&gt;C&lt;/th&gt; &lt;th&gt;D&lt;/th&gt; &lt;/tr&gt; &lt;tr id="row3"&gt; &lt;td&gt;A3&lt;/td&gt; &lt;td&gt;B3&lt;/td&gt; &lt;td&gt;C3&lt;/td&gt; &lt;td&gt;D3&lt;/td&gt; &lt;/tr&gt; &lt;tr id="row4"&gt; &lt;td&gt;A4&lt;/td&gt; &lt;td&gt;B4&lt;/td&gt; &lt;td&gt;C4&lt;/td&gt; &lt;td&gt;D4&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;/table&gt;</code></pre> </div> </div> </p>
 

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