This is not supported with the current version of the plugin, however you may be able to add an icon via CSS the stylesheet by targeting an automatically generated id ‘#tablist(x)-tab(y)’
Include the icon font eg If want to use an icon from WordPress’s included dashicons set you can add the following to your functions.php:
add_action( 'wp_enqueue_scripts', 'cc_load_dashicons' );
function cc_load_dashicons() {
wp_enqueue_style( 'dashicons' );
}
Then either in your child theme stylesheet or via a custom CSS plugin add the CSS rules targeting the specific tab:
.responsive-tabs #tablist1-tab2.responsive-tabs__list__item:before {
content: "\f107";
font-family: 'dashicons';
display: inline-block;
-webkit-font-smoothing: antialiased;
vertical-align: top;
}
It should be possible to add a more streamlined method of adding icons via a new shortcode parameter, and I may add this to a future version of the plugin or as an add-on if I ever had a specific requirement for this in one of my own projects or if someone commissioned the work.
