Div ids are not persisting in rich text editor of CQ5.6

Hi,

     I created a rich text widget and I added plugins. I activated "misctools" plugin also. I clicked on "sourceedit" and paste the code which contains ids for divs like -

<div id="onboarding" class="row onboarding-content scroller">

     . . . . . . . . . . . . .

</div>

After that I clicked ok and again I opened the dialog. But I'm unable to see id. It shows only -

<div class="row onboarding-content scroller">

     . . . . . . . . . . . . .

</div>

I also created "htmlRules/serializer/config" nodes of type nt:unstructured under the richtext editor widget. It worked in 5.5 but not in 5.6.

Whats the problem behind this? Please suggest me the solution for this. Let me know if there is any other way to persist div ids in richtext editor of cq5.6

Regards,

Arya.