True if Microsoft Excel checks to see whether an Office application is the default HTML editor when you start Excel. False if Excel does not perform this check. The default value is True. Read/write Boolean.
Remarks
This property is used only if the Web browser you are using supports HTML editing and HTML editors.
To use a different HTML editor, you must set this property to False and then register the editor as the default system HTML editor.
Example
This example causes Microsoft Excel not to check to see whether it is the default HTML editor.
Application.DefaultWebOptions.CheckIfOfficeIsHTMLEditor = False