gtk:text-tag-scale (object)

object -- a gtk:text-tag object
scale -- a double float for the font size as a scale factor

The accessor for the scale slot of the gtk:text-tag class gets or sets the font size as a scale factor relative to the default font size. This property adapts to theme changes, and so on, so is recommended. Pango predefines some scales such as the pango:+scale-x-large+ value.