Html Attributes are removed after rendering

[Madhi Krishnan]

Hii,
I'am exploring the ofbiz cms plugin.
in Cmssite there is a content with contentId "CMSS_DEC"  and this content
is associated with contentId "CMSS_Demo_header" it contains the below
html content
<div id="header">
                <h1>This is the header!</h1>
  </div>

My Question is is after rendering why the classes , id's and other
attributes  of the html contents are removed?
After inspecting the rendered code it looks like below
<div>
    <h1>This is the header!</h1>
  </div>

Thanks
Madhi Krishnan