Closed Issue: Invalid HTML5 property in Calendar control [27331]

Was using 3.5, downloaded 4.0, and the problem appears in both: there is an invalid property in the Calendar control that kills my HTML5 W3C validation. It appears in the genrated code when using the "StyleFolder" property of the Calendar control:

<link rel="stylesheet" itemprop="url" type="text/css" href="/styles/Default/Calendar/styles/default/style.css" />

The problem is the "itemprop" property. Can this property be fixed/removed somehow while still retaining the StyleFolder functionality?

Thanks.