Challenges feature HTML5, CSS3 and JavaScript (and any other frontend technology, library and framework you wish to work with) and they can be found on https://frontendmentor.io
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Frontend mentor is a brilliant website that offers free and premium challenges for frontend web developers to sharpen their skills and improve and advance further. They have challenges for new developers as well as for advanced developers, so if you are looking for an extra challenge, or if you are new to the web development world and would like to apply your knowledge using real world examples, check them out at Frontend Mentor
As one of those who have taken up the FrontEnd Mentor mantle, you can see what I have done by clicking here
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