JavaScript: The Ultimate Guide to Understand JavaScript Code and its Fundamentals. Discover Literal and Control Flow. Learn Variables, Functions, Object and the Best jQuery.

HTML is not very smart. It mostly lets people look at text and images and allows them to move to other pages where they will do more of the same.
What adds the intelligence to a web page is JavaScript. It makes the website more engaging, effective, and useful by letting pages respond to our visitors when they interact with the content.
This book assumes that we already know how to use HTML to specify web page structure and content. It will be additionally beneficial if we are familiar how pages are styled with CSS, separate from the web page structure. If this is the case then we are ready to add a little behavior to the page and make it more dynamic and interactive with JavaScript. Otherwise, without HTML
and CSS, JavaScript will not do us much good. They are viewed as the three fundamental pillars of the web page: structure, presentation and behavior.