[html5] failure to validate mail link?

[Rob Crowther]

designer wrote:
>        <a href="mailto:designer at gwelanmor-internet.co.uk?subject=problem 
> with RSPCA site">TELL US</a>
> 
Use URL encoding:

<a href="mailto:designer at gwelanmor-internet.co.uk?
subject=problem%20with%20RSPCA%20site">TELL US</a>

(Linebreak for formatting, should be all on one line)

> What am I doing wrong here? I've googled, but to no avail.
>
http://www.eskimo.com/~bloo/indexdot/html/topics/urlencoding.htm

Rob