this.deleteMessageElem(id);
      }
    };
    document.addEventListener('visibilitychange', function(ev){
      cs.pageIsActive = ('visible' === document.visibilityState);
      if(cs.pageIsActive){
        cs.e.pageTitle.innerText = cs.pageTitleOrig;
        console.debug("Taking back input focus.");
        cs.inputFocus(
          /* An attempt to resolve usability problem reported by Joe
             M. where the Pale Moon browser is giving input focus to
             the Preview button. The down-side of this is that it will
             deselect any text which was previously selected on this
             page. This also, unfortunately, places the focus at the
             start of the element, rather than the last cursor position
             (like a textarea would). */);
      }
    }, true);
    cs.setCurrentView(cs.e.viewMessages);

    cs.e.activeUserList.addEventListener('click', function f(ev){
      /* Filter messages on a user clicked in activeUserList */
      ev.stopPropagation();

  flex: 10 1 auto;
  background-color: rgba(156,156,156,0.3);
  overflow: auto;
  resize: vertical;
  white-space: pre-wrap;
  /* ^^^ Firefox, when pasting plain text into a contenteditable field,
     loses all newlines unless we explicitly set this. Chrome does not. */
  cursor: text;
  /* ^^^ In some browsers the cursor may not change for a contenteditable
     element until it has focus, causing potential confusion. */
}
#chat-input-field:empty::before {
  content: attr(data-placeholder);
  opacity: 0.6;
}
#chat-input-field:not(:focus){
  border-width: 1px;