How to do "Hello, World!" in HTML5.
<!doctype html> <title>Hello, World!</title> <p>Hello, World!
Most of the structure of an HTML document, including the
body elements, can be left out without invalidating the
document. Also, most block-level elements are self-closing. For instance, the segment
<p>Hello<div>World is perfectly equivalent to
<p>Hello</p><div>World</div>, which sometimes can be unintuitive, especially in combination with CSS or
the querySelector function.
For more "Hello, World!" examples, go to the Hello World category.