Mobile siteheader is a collapsing banner on the top of the page that starts off expanded and collapses on scroll event and expands again if scrolled back up.
The collapsed state is sticky and scrolls along with the page. Banner is always visible until closed by clicking on the close button.
The close button appears after the banner collapses for the first time and after that it will be on top of both closed and expanded states of the banner. The button is added on top of the banner by DELFI and is located on the top right of the banner.
Mobile siteheader is only shown in articles.