The FaviconCSS property is used to provide custom icons for custom actions by using a CSS class. For that, you have to define the CSS class in the FaviconCSS as a string value and then apply styles to that class in the style section.
In order to add custom icon, you have to define a list and add custom to the list as shown in the following code example.
Define and set a value to the FaviconCSS API in the Dialog builder in the view page as shown in the following code example.
After defining the class, apply styles to that CSS class in the style section as follows.
When the attached sample is run, the following screenshot is the output.
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