You have to test across multiple browsers by yourself.
Cute Editor for ASP.NET is the most powerful WYSIWYG (What You See Is What You Get) browser-based Rich Text Editor for ASP.NET.
It enables ASP.NET Web developers to replace the Textarea in your existing content management system with a powerful, but easy to use WYSIWYG HTML editing component.
Unlike IDE products, CuteEditor doesn't contain some built-in browsers.
asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx
Web Messenger: http://cutesoft.net/Web-Messenger/default.aspx
asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx