Is it essential to type "WWW" when our design contains URL, or is it a matter of taste by now?

Question

I love the appearance of traditional url's, because the **www** in front of them eases and speeds up my understanding that there's definitely a certain web adress.But is there any established **guideline** for formatting url not only for web, e.g. brochures, posters? May be you've heard of some research that proves the better UX due to the url format?We all know, for example, that **telephone numbers** have quite established formatting guidelines.

Answer 1

Actually you do not need this now, you can assign the CNAME to just use the domain minus the www. Additionally, you can have both work.