Not knowing what you hope to achive, it's difficult to help. But HTML isn't for "cool effects" anyway, it's for describing document stucture and content. Use styles and scipting for "cool effects"
In the case of comment boxes, that has even less to do with HTML and everything to do with either server-side scripting or third party services.
For future reference: Your thread title isn't very practical, try to give desciptive thread titles.
Disclaimer. (1) Whilst I will help you sometimes, if I feel like it, and my advice in relation to your actual question will be of good quality: my posts are to be taken with a pinch of salt. I will be sarcastic, deploy irony and include obscure cultural references for my own amusement without warning.
(2) You will gain nothing from complaining, and if you try to argue with me then you will not win. No matter how noble your battle seems, I am still better than you, don't be an hero.