Specifications for the HREF in various tags

I couldn't find a clear specification on the HREF attribute and I'm
hoping someone will have the right answer.

Which of the following HREF is the correct one? Is it a requirement that
all HREFs be enclosed in " " or is it also correct to enclose them in '
..'?


1. <AREA SHAPE="RECT" COORDS="5, 9, 53, 36" HREF="default.html">
2. <IMG SRC='default.gif' >
3. <A HREF=default.cfm>

Also, does the specification change depending on whether it is an AREA,
IMG, or A tag?

Thanks
--
Kayshav Dattatri
kayshav@netscape.com
http://people.netscape.com/kayshav