Displaying ionicons

ion-icon name=“add”>
ion-icon name=“ion-arrow-down-b”>


The top one gives a plus, but the bottom shows blank or nothing.

I have read the docs and done some research to no real answers.
I am porting work I already did that uses bootstrap and a treeview I made via angular2.
Bootstrap gives the icons for the tree automagically so I didn’t mess with what worked.
Now using ion-content and trying to build my tree, having trouble just displaying a simple arrow icon to show the start of each node.
a class=“ion-arrow-right-b”> doesn’t work either.
?
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The top one gives a plus, but the bottom shows blank or nothing.

I have read the docs and done some research to no real answers.
I am porting work I already did that uses bootstrap and a treeview I made via angular2.
Bootstrap gives the icons for the tree automagically so I didn’t mess with what worked.
Now using ion-content and trying to build my tree, having trouble just displaying a simple arrow icon to show the start of each node.
doesn’t work either.
?