What is the Header Check Mark?

My first try at DW, so lots of simple questions!
When I create a table on a page, in the Propery Inspector, there is an item named "Header" with check  (default) mark in front of it. What is this property and why is it checked by default?

It creates a table with - umm - a header( a <th> element) and not just data cells (<td>). Per se there is no requirement for this, as even data cells can be formatted to look like headers, but it would be important for accessibility, as it defines the tab order and the order in how e.g. screen readers may interpret the elements. These tools understand structure, not content, if you will, so establishing clear hierarchies is always good for them.
Mylenium

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    Last edited by hunterthomson (2008-08-10 11:17:47)

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