<!DOCTYPE html><title>iframe: changing the scrolling attribute</title><linkrel="author"href="mailto:masonf@chromium.org"><linkrel="help"href="https://html.spec.whatwg.org/multipage/rendering.html#the-page"><linkrel="match"href="iframe-scrolling-attribute-ref.html"><style>iframe{width:100px;height:100px;}</style><p>These two iframes should *both* render with scrollbars:</p><iframesrc="support/big-page.html"scrolling="unknown"></iframe><iframesrc="support/big-page.html"scrolling="unknown"></iframe><script>variframe=document.getElementsByTagName("iframe")[1];// Setting scrolling=no and then back to scrolling=unknown// should result in a final value of auto.iframe.setAttribute("scrolling","no");iframe.setAttribute("scrolling","unknown");</script>