I think the issue is that I am adding contentEditable="true" to an ASP Label which you can't really do.

I've tried doing this:

<h1 id="h1Test" contenteditable="true" runat="server"><asp:Label ID="h1" runat="server" CssClass="intro"></asp:Label></h1>

But I'm not sure how to get the h1Test assigned to a string variable in the code-behind file