HTML5 & CSS3

HTML5

You may well ask: “How can I start using HTML5 if older browsers don’t support it? HTML5 is not one big thing; it is a collection of individual features.

You may think of HTML as tags and angle brackets. That’s an important part of it, but it’s not the whole story. The HTML5 specification also defines how those angle brackets interact with JavaScript, through the Document Object Model (DOM).

HTML5 builds on that success of HTML4.

HTML5 supports all the form controls from HTML 4, but it also includes new input controls.

The doctype should already be on the first line of every HTML page. Previous versions of HTML defined a lot of doctypes, and choosing the right one could be tricky. In HTML5, there is only one doctype:

<!DOCTYPE html>

HTML5 is here to stay

Every element, every attribute, every feature of HTML that you’ve ever used — someone created them, decided how they should work, and wrote it all down.

CSS3

Cascading Style Sheets (CSS) is a style sheet language used for describing the look and formatting of a document written in amarkup language. While most often used to change the style of web pages and user interfaces written in HTML and XHTML, the language can be applied to any kind of XML document, including plain XML, SVG and XUL. Along with HTML and JavaScript, CSS is a cornerstone technology used by most websites to create visually engaging webpages, user interfaces for web applications, and user interfaces for many mobile applications.
CSS 3 is divided into several separate documents called "modules". Each module adds new capabilities or extends features defined in CSS 2, preserving backward compatibility.

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