Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script> function myFunction(elmnt,clr) { elmnt.style.color=clr; } </script> </head> <body> <p onmousedown="myFunction(this,'red')" onmouseup="myFunction(this,'green')"> Click the text to change the color. A function, with parameters, is triggered when the mouse button is pressed down, and again, with other parameters, when the mouse button is released. </p> </body> </html>
Result:
W3Schools.com - Try it yourself