ALIGN and SRC used in conjunction with the IMAGE attribute.

MAXLENGTH for limiting the number of characters that can be entered in a TEXT field and SIZE for controlling the displayed length of a TEXT field:

<INPUT TYPE="TEXT" MAXLENGTH=5 SIZE=5> 

CHECKED to select a default for a checkbox or set of radio buttons:

<INPUT TYPE=checkbox CHECKED> 
<INPUT TYPE=radio> <INPUT TYPE=radio CHECKED>