Once Doxia is updated to support HTML5.2 as per https://www.w3.org/TR/html52/ in DOXIA-575, use XHTML5 by default.
Generate (X)HTML5 by default
Remove all   in default-site-macros.vm and replace by a space
Add support for (X)HTML5
Upgrade Mockito Core to 2.28.2
Upgrade htmlunit to 2.24