You may wish to begin by reading the [text widget conceptual overview](TextWidget.
html) which gives an overview of all the objects and data types related to the text widget and how they work together.
Tags should be in the TextTagTable for a given
TextBuffer before using them with that buffer.
create_tag is the best way to create tags. See “gtk3-demo” for numerous
examples.
For each property of TextTag, there is a “set” property, e.g. “font-set” corresponds to “font”.
These “set” properties reflect whether a property has been set or not. They are maintained by GTK+ and you should not set them
independently.