SP.FieldMultiLineText.richText property (sp.js)
Gets or sets a value that specifies whether the field supports rich formatting.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.FieldMultiLineText.get_richText ()
var value = SP.FieldMultiLineText.set_richText ()
Return value
Type: Boolean