Why does toStaticHTML remove data-* attributes

Question

My application dynamically builds HTML content as a string and when finished the content is being attached to the DOM. In WinJS however this throws exceptions once I try to

Answer 1

The data-role-attribute is not listed here: http://msdn.microsoft.com/en-us/library/windows/apps/hh465388.aspx

It's an unknown attribute and will be removed.