thanks and minor suggestion

Thanks for this service everybody!
 
I just have a couple of tips you could add relating to these two
presumably common errors:
 
Line 15, column 114: there is no attribute "HREF" (explain...). 
  ...> <a href = '/pet'>PET</a> <a HREF = '#bottom'>bottom</a> <h1>g a s
b o y s .
                                          ^
Line 35, column 97: end tag for "input" omitted, but OMITTAG NO was
specified 
  ...ogin" value="Create new account"></td>
 
 
Suggesting 
-          lowercasing the first problem attribute 
-          and terminating the second tag with /> rather than >
 
would have saved me some time!
 
Best wishes
Erich