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  1. PO
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    <p>A <code>&lt;table&gt;</code> can have multiple <code>&lt;tbody&gt;</code> children, which represent row groups. I've not used the <code>&lt;colgroup&gt;</code> element before, so I'll leave that for someone else to add, but here is a solution that will allow you to achieve your styling needs whilst keeping it semantic:</p> <pre><code>&lt;table&gt; &lt;tbody&gt; &lt;tr&gt; &lt;th scope="col"&gt;col 1&lt;/th&gt; &lt;th scope="col"&gt;col 2&lt;/th&gt; &lt;th scope="col"&gt;col 3&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 1&lt;/td&gt; &lt;td&gt;row 1&lt;/td&gt; &lt;td&gt;row 1&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 2&lt;/td&gt; &lt;td&gt;row 2&lt;/td&gt; &lt;td&gt;row 2&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 3&lt;/td&gt; &lt;td&gt;row 3&lt;/td&gt; &lt;td&gt;row 3&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;tbody&gt; &lt;tr&gt; &lt;th scope="col"&gt;col 4&lt;/th&gt; &lt;th scope="col"&gt;col 5&lt;/th&gt; &lt;th scope="col"&gt;col 6&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 4&lt;/td&gt; &lt;td&gt;row 4&lt;/td&gt; &lt;td&gt;row 4&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 5&lt;/td&gt; &lt;td&gt;row 5&lt;/td&gt; &lt;td&gt;row 5&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 6&lt;/td&gt; &lt;td&gt;row 6&lt;/td&gt; &lt;td&gt;row 6&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;tbody&gt; &lt;tr&gt; &lt;th scope="col"&gt;col 7&lt;/th&gt; &lt;th scope="col"&gt;col 8&lt;/th&gt; &lt;th scope="col"&gt;col 9&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 7&lt;/td&gt; &lt;td&gt;row 7&lt;/td&gt; &lt;td&gt;row 7&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 8&lt;/td&gt; &lt;td&gt;row 8&lt;/td&gt; &lt;td&gt;row 8&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;row 9&lt;/td&gt; &lt;td&gt;row 9&lt;/td&gt; &lt;td&gt;row 9&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;/table&gt; </code></pre> <p>I based this on information from the <a href="http://dev.w3.org/html5/spec/Overview.html#tabular-data" rel="nofollow noreferrer">HTML 5 spec</a>, but it should be valid HTML 4 as well.</p>
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    1. POSetting rowspan on colgroup?
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    1. COI thought of doing multiple tbodies, but I wasn't sure if that was semantically the most correct approach, because of the relationship between the various groups of data. I agree completely that it's an easy and efficient method without resorting to nested table hacks, but... the data in each "super-column" is actually all related, so I don't want to separate it from the surrounding (above or below) columns in such a way that I lose that relationship. The data in col 1 row 1 is relevant to the data in col 7 row 9, its just MORE relevant to the data in col 1 row 4 and row 5.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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