Thank you for your contribution @techcoderx !

1. It is better to use === instead of == (!== instead of !=)in JS and ==true seems redudant.
2. Some parts of the JS code end with a semicolon but some do not.
3. some vars could be replaced by either const or let.
4. The messages you are alert-ing in the JS code could be extracted in a JSON file so that you can internationalize them later.
5. Unit Tests missing in the project - you could use mocha/chai or other testing frameworks and set up the CI using travis-ci.com

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