We use HTML to structure our web documents.

I think Rev. Green did it in the kitchen with the chainsaw.

My birthday is on the 25^th of May 2001.

Caffeine's chemical formula is C₈H₁₀N₄O₂.

If x² is 9, x must equal 3.

var para = document.querySelector('p');

para.onclick = function() {
  alert('Owww, stop poking me!');
}

You shouldn't use presentational elements like <font> and <center>.

In the above JavaScript example, para represents a paragraph element.

Select all the text with Ctrl/Cmd + A.

$ ping mozilla.org
PING mozilla.org (63.245.215.20): 56 data bytes
64 bytes from 63.245.215.20: icmp_seq=0 ttl=40 time=158.233 ms