I've started with an HTML5 Master Page and am having trouble making the Header disappear when I use the ribbon functionality. The ribbon just pushes the Title down. I would very much not like to add addition script to make this work. I have tried placing the class "s4-titlerowhidetitle" in various tags to no avail.
Per Heather Solomon: Instead of class="titlerowhidtitle", an id="s4-titlerow" can be placed in the header. This causes it to be hidden when the ribbon is activated.