annotations demo Page
<p>dsfdsafs<span class="mce-annotation" data-mce-annotation-uid="mce-annotation_94269650211529705226881" data-mce-annotation="alpha" data-mce-comment="dsaf">dfasdf</span></p><p><br data-mce-bogus="1"></p><p><span class="mce-annotation" data-mce-annotation-uid="mce-annotation_94269650211529705226881" data-mce-annotation="alpha" data-mce-comment="dsaf">dsafs</span>adf</p>
Test api, select some text (collapse or ranged) then paste api below to add annotation
tinymce.activeEditor.annotator.annotate('alpha', {'author': 'Its Me'});