2.3.1 [DOM Level 2 - HTML] Section 1.6.5, Object definitions

E0001:

The specification states:

 form of type HTMLFormElement, readonly 
 Returns the FORM element containing this control. Returns null if this control is 
 not within the context of a form.

Quirks Mode, IE7 Mode, and IE8 Mode (All Versions)

The value of the form attribute of the HTMLTextAreaElement interface can be set.

E0002:

The specification states:

 contentDocument of type Document, readonly, introduced in DOM Level 2
 The document this frame contains, if there is any and it is available, or null 
 otherwise.

Quirks and IE7 Mode (All Versions)

The value of the contentDocument attribute of the HTMLFrameElement interface can be set.