I am building a 'progressive' web app that will be available offline. I'm 
totally new to 'progressive apps' I have what may be a really newbie 
question, but I'm trying to plan ahead.  

I am still in the early stages right now. If the user uses facebook for 
authentication, I would like to use their profile pic in the app header 
toolbar. 

The url for such a profile pic is, for example, 
 https://scontent.xx.fbcdn.net/hprofile-xpa1/v/t1.0-1/c0.7.50.50/p50x50/2987. 
I don't want the url to be called everytime the page refreshes. So, I 
thought about using platinum-sw to save the pic with strategy 
`toolbox.cacheFirst`.

Since later on I will be implementing off line capabilities 
with platinum-sw  with the default strategy, I am not sure if this will be 
a issue. 

Can I have two separate platinum-sw elements with different strategies in 
the same web app? Or would there be side effects and issues?


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