I've found this question and I understand that the HTML5 specifications say that. Period.
But I'm creating a MVC3 app that uses Google Charts API (images) and I need to use images with links to a google adress and they have a querystring. Just like this:
http://chart.apis.google.com/chart?chs=440x220&cht=t&chco=EFEFEF&chld=BRJPUS&chd=t:20,30,50&chtm=world
I've tested getting a working chart and change a single ampersand to & and the chart returned a error from Google.
How to fix this?