Fix #7: Templating: add data-attr
Fix #7: Templating: add data-attr

qwe2/websharper.ui.next,intellifactory/websharper.ui.next,intellifactory/websharper.ui.next,ChrisDobby/websharper.ui.next,Micha-kun/websharper.ui.next,intellifactory/websharper.ui.next,Micha-kun/websharper.ui.next