Some styles does not work (background-color, background-image)

Works: Label {     text: "<span style=\"color: red\">Del</span>"     textFormat: Text.RichText } Does not work: Label {     text: "<span style=\"background-color: red\">Del</span>"     textFormat: Text.RichText } Label {     text: "<span style=\"background-image: some_url\">Del</span>"     textFormat: Text.RichText }