Chromium not showing icon

I am using a ui dashboard template to display a material design icon.
The code in the template is
<i class = "material-icons {{msg.payload}}"></i>
Where msg.payload is "trending_up". To give the overall string of trending_up. This icon is displaying fine in my chrome browser on my PC, but not in chromium which is running on the raspberry pi.
Font awesome icons eg work fine, but they don't have a nice squiggly trend line.
Despite much googling and trolling the excellent forum posts I seem to be the only victim, or most likely I am overlooking a very basic command?
Any help appreciated.