<!DOCTYPE html> <link rel=author href="mailto:jarhar@chromium.org"> <link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1266891"> <details id=details open="true">hello world</details> <script> document.execCommand("selectAll"); details.open = false; document.execCommand(false); document.body.attachShadow({mode: 'open'}); </script>