https://help.eclipse.org/latest/topic/org.eclipse.platform.doc.isv/reference/api/org/eclipse/e4/ui/css/swt/properties/custom/CSSPropertye4SelectedTabFillHandler.html
CSSPropertye4SelectedTabFillHandler (Eclipse Platform API Specification)
declaration: package: org.eclipse.e4.ui.css.swt.properties.custom, class: CSSPropertye4SelectedTabFillHandler
platform apieclipsespecification