HTML stands for Hyper Text Markup Language, which is the most widely used language on Web to develop web pages. It was created by Berners-Lee in late 1991 but “HTML 2.0” was the first standard HTML specification which was published in 1995. HTML 4.01 was a major version of HTML and it was published in late 1999. Though HTML 4.01 version is widely used but currently we are having HTML-5 version which is an extension to HTML 4.01, and this version was published in 2012.
All HTML documents must start with a document type declaration: <!DOCTYPE html>. The HTML document itself begins with <html> and ends with </html>. The visible part of the HTML document is between <body> and </body>.
<h1>My First Heading</h1>
<p>My first paragraph.</p>
You can download the HTML-Help-Sheet from this link
Click here to Get Html-Help-Sheet
You can download the references from this link.
Download Html and CSS reference