Where to find sample javascript app code developed without any framework

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Javascript

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where to find sample java script front end app code which have been developed without any framework. web application application in plain javascript.
I am new to javascript and web application also , before going to any framework i want to try some project in simple javascript

mainly i want to know how micro apps within a web app communicates . Also how js web app starts and load init. What is flow within app.

What I have tried:

Created a mvc app . But want to know if my app have two modules then how they communicates each other . also if if there is more than two modules in my app , how app will start and how different parts communicates with each other.

i want to do this by without any framework help.