Bookmark
Get a bookmark interval by its name
var bookmark = richEdit.document.bookmarks.find('bookmarkName')[0];
if (bookmark) {
var bookmarkInterval = bookmark.interval;
}
Insert a bookmark
var textInterval = richEdit.document.insertText(0, 'text');
var bookmark = richEdit.document.bookmarks.create(textInterval, 'bookmarkName');
Scroll to a bookmark
var bookmark = richEdit.document.bookmarks.find('bookmarkName')[0];
if (bookmark)
bookmark.goTo();