<!DOCTYPE html> <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1290093"> <div style="columns:2;"> <span style="position:relative;"> <div style="position:absolute;"></div> <div id="spanner" style="column-span:all;"></div> </span> </div> <script> document.body.offsetTop; // This doesn't actually affect layout, but changing display type requires re-attach. spanner.style.display = "flow-root"; </script>