As you know in these days HTML markup validation is becoming a common pratice. W3C offers his tool ( The W3C Markup Validator ) and it’s really useful to find obsolte code from old HTML revisions like the famous

<br clear="both"/>

Oh my br, i loved you a lot in past years, but it’s time to DIE! Nowadays it’s better to use

overflow: hidden;

to reset floating stuff.

Thank you W3C and goodbye BRCLEAR. You served the web well.