Can Anyone suggest a project on HTML, CSS and JS combined use so that I can test my skills ??

Answer 1

https://www.sololearn.com/Discuss/303539/?ref=app

Answer 2

A calculator!

Answer 3

make a circle increasing and decreasing its radius periodically

Answer 4

try to make a HTML5 game/app in that you have to use combination of all of these js, css, html
work on your own idea. if you don't have an idea crawl sololearners code and start modification in their codes specially JavaScript.