w3.org/TR/css3-flexbox

canisuse.com/flexbox

wiki.csswg.org/spec/flexbox-2009-2011-spec-property-mapping

MSDN Flexible box (“flexbox”) layout msdn.microsoft.com/en-us/library/ie/hh673531(v=vs.85).aspx

css-tricks.com/old-flexbox-and-new-flexbox

dev.opera.com/articles/view/flexbox-basics

xanthir.com/blog/b4580