What does this mean?

Error Line 95, Column 56: end tag for "input" omitted, but OMITTAG NO was specified

  <td><input type="button" value="Add to Cart"></td**>

You may have neglected to close an element, or perhaps you meant to "self-close" an element, that is, ending it with "/>" instead of ">".
Info Line 95, Column 11: start tag was here

  <td>**<**input type="button" value="Add to Cart"></td>

 I thought the element was closed properly. What am I doing wrong here?

Oh, I saw what I had wrong. I didn't close

<input type="button" value="Add to Cart" />

Oops. Sorry.

Try this:

<input type="button" value="Add to Cart" />
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