QUESTION
I viewed an HTML source where I saw
<TR><TD>
I do not see these mentioned in the HTML Quick Reference in your book. What do these stand for?
ANSWER

Those are part of the Netscape table tag set. Basically, you use <TABLE> to specify a table, then each row is <TR> (table row), and each data cell within the row is <TD>, table data.

Here's a fast example:

        <TABLE BORDER=3>
        <TR>
          <TD>January</TD> <TD>300</TD>
        </TR><TR>
          <TD>February</TD>  <TD>400</TD>
        </TR><TR>
          <TD>March</TD> <TD>200</TD>
        </TR>
        </TABLE>
Here's how that'd look if you have Netscape Navigator or another program that can handle this type of HTML tag:

January 300
February 400
March 200

There's also a good reference page on tables:

http://home.netscape.com/assist/net_sites/tables.html