Rich Text๏
Certain text blocks support rich text markup. These are tags which modify the appearance of the text for example bold, italics, colors, etc.
Which tags are supported depends on the Glazier mode being used. Most players will be using the default, uGUI.
uGUI - TextMesh Pro (default)๏
For the full list of tags please refer to the TextMesh Pro documentation here: https://docs.unity3d.com/Packages/com.unity.textmeshpro@2.2/manual/RichText.html
IMGUI๏
For the full list of tags please refer to the Unity styled text documentation here: https://docs.unity3d.com/2018.3/Documentation/Manual/StyledText.html