Opera is not one of the three main browsers. The three main browsers are, in order, IE, Firefox and Safari. Personally, I don't use Opera or one of the three

Opera is not one of the three main browsers. The three main browsers are, in order, IE, Firefox and Safari. Personally, I don't use Opera or one of the three main browsers most of the time, so I periodically run into a site that tells me they don't support my browser, in which case I switch browsers. I don't expect everyone to cater to my whim all the time.