XP tracker

The XP Counter or Experience Counter was originally released by Jagex to members along with the Bonus XP Weekend on March 12, 2010. Exactly a month later, the XP Counter was released on 12 April 2010 to all players. This counter is located directly under the compass and to the left of the minimap. It didn't get very much attention because it was displayed on the same announcement that unveiled the much-anticipated skill, Dungeoneering. The icon for the XP Counter was originally a circle with "XP+". On April 13, 2010, (a day after the main release) the XP Counter icon was changed slightly and the "XP+" was simply changed to "XP".

Function
When the counter icon is left-clicked, a small box to the left of the icon will appear: the counter. It counts the amount of experience a player has received since they last reset it. Logging in or out does not affect the counter whatsoever. Everytime a player has the counter out and receives experience (from any skill), experience is added to the count and a small ribbon and the amount of experience they have just received slides down the right side of the screen. To reset the counter, either right-click and click "Reset" or simply left click on the (rectangular) counter.

Trivia

 * While the XP Counter and Dungeoneering were still relatively new, the XP Counter reset about once every 3 minutes while a player was Dungeoneering, seeing as both the counter and the skill still had many bugs. Early release versions of the XP Counter reset (independently of Dungeoneering) during a session.
 * Occasionally, the counter will reset itself spontaneously upon player death.
 * Interestingly, the alt-text when hovered over the XP counter button is "Click", which does not tell anything useful about the button itself. Other buttons has more informative alt-text such as "World Map" or "Turn run mode on"