HTML5 section tag defines sections in a document, such as chapters, headers, footers, or any other semantically discrete portions of the content.
HTML5 Charset – Character Encoding Declaration
To inform the browser about character set used in HTML5 document, you need to use the meta tag with attribute name charset.
HTML5 DOCTYPE Declaration Example
Technically, to parse and display a page correctly, a browser needs to know the DOCTYPE type of HTML document which tells the browser which version of HTML it should expect in the document.