HTML Imports
https://www.w3.org/TR/html-imports/
removed (2020.07.01)
https://caniuse.com/#search=html imports
https://www.html5rocks.com/en/tutorials/webcomponents/imports/
https://www.w3schools.com/howto/howto_html_include.asp
Pub/Sub JavaScript Design Pattern
https://davidwalsh.name/pubsub-javascript
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