Image files used in the icon properties for actions and visual components, e.g. Button, can be added to your theme extension.

For example, to add an icon to the Halo theme extension, you have to add the image file to the modules/web/themes/halo directory described in the Extending an Existing Theme section (it is recommended to create a subfolder):

In the following sections, we consider using the icons in visual components and adding icons from arbitrary font libraries.