An a acute displays as á in this browser when using the code number in hexadecimal format.

An a acute displays as á in this browser when using the code number in decimal format.

An a acute displays as á in this browser when using the HTML name for the character.

However, not all characters have an HTML name and some browsers do not respond to the use of the code number in hexadecimal format, so the general method is to use the code number in decimal format.