Graham TECRIDIBLE the 'mini' browsers do not support scrolling text or animation by design
"Animation of any kind (including animated GIFs, animated SVG, or the <blink> or <marquee> elements) is not supported in Opera Mini because the server pre-renders the page and merely sends the client a snapshot of it."
https://dev.opera.com/articles/opera-mini-content-authoring-guidelines/#basic-html-css