It was from font awesome. You have to get the cdn link from the font awesome site.

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That means that you are not serving the file from your web app.

Font awesome 4 cdn not working. This often indicates a clash between versions. Common problems with new versions can give you a flashing question mark icon. I tried using the cdn from the get started link and it seems to not work for me.
After some research we tracked down the missing icon. Here are a few ways you can fix this issue: For some reason font awesome was not displaying when the cdn was enabled.
This is what it looks like: If you want to use the cdn, then you need to use the address for the file on the cdn, not on your web app. Font awesome 5 uses slightly different class names for their icons.
Include it in the head of your code and it should work fine. It was clear an icon or element was not present. I replaced it with the following in the href part of the cdn and it worked for me:
You're not getting the file from the cdn, you're getting it from your web app. When we enabled our cdn and viewed the site in firefox the drop down menu icons were missing but not in chrome. (don't use this one, the id in there is not valid).
In version 4, you’d use something like.

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