Each element on a page is identified by a tag. Tags are always inside < and > Most elements also have a closing tag that is just like the opening tag except with </ instead of just <.
In the HTML below, notice the <html> tag on the second line and the closing </html> in the last line.
The next element is the head: it has an opening tag <head> and a closing tag </head>
Completely enclosed inside the head element is a title element.
<!doctype html> <html> <head> <meta charset="utf-8"> <title>HELLO WORLD</title> </head> <body> <p>Hello World</p> </body> </html>
Most web pages have many, many elements. One element can be nested completely inside another element as shown below:
However, one element can not span two separate elements. In the illustration below the yellow box is not a valid element because it is half in the element shown in blue and half in the element shown in red.
HTML Tags