HIE:Common.js/edit.js

function forcePreview() {
  if (mw.config.get('wgUserName') != null || mw.config.get('wgAction') != "edit") return;
  saveButton = document.getElementById("wpSave");
  if (!saveButton) return;
  saveButton.disabled = true;
  saveButton.value = "Sačuvaj stranicu (pritisnite Prikaži)";
  saveButton.style.fontWeight = "normal";
  document.getElementById("wpPreview").style.fontWeight = "bold";
}
$(forcePreview);