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Attribute for <INPUT ...>
CHECKED

CHECKED indicates that a radio button or checkbox should be on when the form first loads.

this code produces this 
<FORM ACTION="../cgi-bin/mycgi.pl">

<INPUT TYPE=CHECKBOX NAME="maillist" CHECKED>Yes! Put me on the list!

<P><INPUT TYPE=SUBMIT VALUE="submit">
</FORM>
Yes! Put me on the list! 

<FORM ACTION="../cgi-bin/mycgi.pl">

What color would you like?<BR>
<INPUT TYPE=RADIO NAME="color" VALUE="green"         >Green<BR>
<INPUT TYPE=RADIO NAME="color" VALUE="red"           >Red<BR>
<INPUT TYPE=RADIO NAME="color" VALUE="blue"  CHECKED >Blue<BR>
<INPUT TYPE=RADIO NAME="color" VALUE="brown"         >Brown


<P><INPUT TYPE=SUBMIT VALUE="submit">
</FORM>
What color would you like?
Green
Red
Blue
Brown

Checkboxes are off by default. There is no default for which radio button is on when the form loads; most browsers have none on, some put the first one on.

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