Presto
↑ 300 million users and move to WebKit
↑ Opera version history At first Electra was the codename for the Opera 4.0 browser but was later designated as a layout engine name for Opera versions 3.5 through 6
↑ “Opera Dragonfly documentation”. Opera Software. 2009年2月27日閲覧。
↑ “Reviewer’s Guide to Opera Mobile 9.5 Beta”. Opera Software. 2009年2月27日閲覧。
↑ Lawson, Bruce (2008年9月10日). “Opera Presto 2.1 - Web standards supported by Opera’s core”. Opera Software. 2009年2月27日閲覧。
↑ "Opera announces the new Opera Mobile 9.