IE11 contenteditable testing
HTML
<table id="emailContentTableInner" class="editable mce-content-body" cellpadding="0" width="550" cellspacing="0" border="0" align="center" valign="center" style="padding: 0px; margin: 0px; width: 550px; position: relative; background-color: transparent;" contenteditable="true" spellcheck="false" data-mce-selected="1"><tbody><tr data-type="text-row" data-row-name="Text"><td colspan="100" valign="top"><div style="padding: 25px 0px 8px; margin: 0px; border: none; font-family: 'Helvetica Neue', Arial; text-transform: none; font-size: 16px; text-align: left; line-height: 24px; color: #3c3c3c; font-weight: normal; letter-spacing: normal; max-width: 550px; background-color: transparent;" data-mce-style="padding: 25px 0px 8px; margin: 0px; border: none; font-family: 'Helvetica Neue', Arial; text-transform: none; font-size: 16px; text-align: left; line-height: 24px; color: #3c3c3c; font-weight: normal; letter-spacing: normal; max-width: 550px; background-color: transparent;">You've been invited to</div></td></tr><tr data-type="text-headline-row" data-row-name="Headline"><td colspan="100" valign="top"><h1 style="max-width: 550px; width: 100%; padding: 0px 0px 20px; margin: 0px; color: #d67a6a; font-weight: 500; font-family: 'Helvetica Neue', Arial; font-size: 31px; text-transform: none; line-height: 34px; text-align: left; border: none;" data-mce-style="max-width: 550px; width: 100%; padding: 0px 0px 20px; margin: 0px; color: #d67a6a; font-weight: 500; font-family: 'Helvetica Neue', Arial; font-size: 31px; text-transform: none; line-height: 34px; text-align: left; border: none;">Hubs Galore 3</h1></td></tr><tr contenteditable="false" data-type="image" data-row-name="Image"><td style="text-align: center; position: relative;" colspan="100" data-mce-style="text-align: center; position: relative;"><a href="[event_url]" target="_blank" data-mce-href="[event_url]"> <img style="display: block; max-width: 550px; padding: 0 0 20px; margin: 0; border: none;"...