Changing the size of a table is useful when you want a table to take up a specific amount of space on your Web page.
The WIDTH attribute allows you to change the width in pixels or as a percentage of the Web browser window. When specifying a width in pixels, use a width of 600 pixels or less to ensure the entire table will fit on a user's screen. If you want the width of your table to vary according to the size of the Web browser window, specify the width as a percentage of the window.
Use the HEIGHT attribute to change the height of a table by specifying a new height in pixels or as a percentage of the Web browsers window.
If you specify a width or height that is smaller than the contents of a table, a Web browser will display the table as small as the contents of the table allow.
Some Web browsers do not support the HEIGHT attribute.
Type this.
<TABLE BORDER=3 WIDTH=400 HEIGHT=300 ALIGN=CENTER>
<TR>
<TD ALIGN=CENTER>your text or image</TD>
</TR>
</TABLE>