The tooltip or infotip or a hint is a common graphical user interface element. It is used in conjunction with a cursor, usually a pointer. The user hovers the pointer over an item, without clicking it, and a tooltip may appear—a small "hover box" with information about the item being hovered over. Tooltips do not usually appear on mobile operating systems, because there is no cursor (though tooltips may be displayed when using a mouse).
Scalable Vector Graphics (SVG) is an XML-based vector image format for two-dimensional graphics with support for interactivity and animation. The SVG specification is an open standard developed by the World Wide Web Consortium (W3C) since 1999.
HTML5 is the future of layout rendering and Chart.js is here to usher data charts into that future. Chart.js is perhaps the classic open source library for generating any type of data chart, graph, or visualization element.
If you are going to use a preloader in your next site then why not make it worth watching. Here are some great examples found at CodePen to get your creative juices spinning.
This book is a great book for someone who is attempting to learn Web development technologies. There is so much to learn, and the flow of this book provides a great way to get started.