At first, you may not notice significant changes from previous versions, but the a HTML renderer has been completely overhauled and updated.  Now, reports are rendered to HTML 5 standards whereas, they should consistently maintain the same appearance and behavior in all modern browsers that support the HTML 5 standard such as Microsoft Edge, IE 11, and newer versions of Google Chrome, Safari and Firefox.  This change is a welcome improvement which should clear up many problems with inconsistent and quirky report layouts while using different web browsers and devices.  By the same token, the change means there is no specific backward-compatibility for outdated browsers; consequently,  reports that may have worked (or partially worked) in an old version of Internet Explorer may no longer work until the user upgrades.