Americane already answered your questions. Try these too and lets us know whether or not it worked for you.

 http://www.w3schools.com/html/tryit.asp?filename=tryhtml_intro
http://www.draac.com/htmltester.html
http://www.htmlinstant.com/2010/11/live-html-editor.html
http://htmledit.squarefree.com/