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I always see the th tag only used in the first row of the table. Is there some specific reason why it can't be used to create 'left' headers along the leftmost column. Is this bad form, or is this ok.
Basically, a table with headings on the top row and the leftmost column, with the very top left square being empty.
e.g.
<table>
<tr>
<th><!--empty--></th>
<th>Top 1</th>
<th>Top 2</th></tr>
<tr>
<th>LeftHeader?</th>
<td>data1</td>
<td>data2</td></tr>
</table>
407
<th>: The Table Header element. The <th> HTML element defines a cell as header of a group of table cells. The exact nature of this group is defined by the scope and headers attributes.
A table header is a row at the top of a table used to label each column.
A table header row is the top row of a table that acts as a title for the type of information they will find in each column. It's common to manually bold the top row to signal this information visually, but it's important to mark table headers at the code level so the change is also structural.
Table heading can be defined using <th> tag. This tag will be put to replace <td> tag, which is used to represent actual data cell. Normally you will put your top row as table heading as shown below, otherwise you can use <th> element in any row. Headings, which are defined in <th> tag are centered and bold by default.
That's valid, however, when using a <thead> it has to be the first row. This is valid:
<table>
<thead>
<tr>
<td>0,0</td><td>1,0</td><td>2,0</td>
</tr>
</thead>
<tr>
<th>0,1</th><th>1,1</th><th>2,1</th>
</tr>
</table>
But this is not:
<table>
<tr>
<td>0,0</td><td>1,0</td><td>2,0</td>
</tr>
<thead>
<tr>
<th>0,1</th><th>1,1</th><th>2,1</th>
</tr>
</thead>
</table>
It's invalid HTML and you can double check that with the w3C markup validation service though before you do you'll have to add a <!DOCTYPE> declaration and the rest of a valid HTML doc.
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