Click to Watch in HD > 02 Web Designing - Html syntax
Watch ----HTML Syntax---
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.
What you see in angle brackets lees than angle and greater than are HTML tags. They define where something starts and where it ends.
All HTML need to have a DOCTYPE declared. The DOCTYPE is not actually an element or HTML tag. It lets the browser know how the document should be interpreted, by indicating what version or standard of HTML (or other markup language) is being used.
For HTML5 documents (which nearly all new web documents should be), the DOCTYPE declaration should be:
file extension .html