Thank you !
Now, I’ve found 2 typos in the suscribe widget (in version 4.2.1) which prevent html validation of the page containing the widget :
Line 827 , there is a ” in excess :
. $text_color . '>' . $params['label'] . '</label>';
Line 832 , there is a missing space before class :
. ' class="eelv_news_input ' . esc_attr($params['input_class']) . '"/>'
—
Bruno