Java applet
DHTML control
dojo
(this applies to 8.5.1 FP? and beyond)
When a rich text field's web edit property is marked "Best Fit For OS", the web server selects one of the HTML editors based on the browser.
The Java Applet is used for all browsers but Internet Explorer.
For IE, either the built in DHTML control or the Javascript control (the dojo rich text editor) depending on the version of IE and the Windows OS version (running the browser)
to use dojo on more browsers, you can modify the browser.cnf rule for "RTEditorBestFit".
For example the following will allow the dojo control to be used by all browsers when a
field has been designated "Best Fit For OS"
Property RTEditorBestFit String Legacy
Rule JSControl MSIE [6-9].* Windows NT [6-9]
Rule JSControl Firefox/[3-9]
Rule JSControl Version/[3-9][0-9\.]* Safari
Rule JSControl Chrome/[2-9]