You must add ng-app=""to the tag htmlso that angular pops up on the page. After that, the page starts moving and collects the entire directive, and it compiles them.
<html lang="en" ng-app="">
Instead of ng-includewith, srcyou can directly pass the value of the template in the attribute ng-include.
<div ng-include="'content.html'">
Demo plunkr
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