2.1.30 [HTML] Section 13.5, Notes on embedded documents

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V0053:

The specification states:

 Sometimes, rather than linking to a document, an author may want to embed it 
 directly into a primary HTML document. Authors may use either the IFRAME element or 
 the OBJECT element for this purpose, but the elements differ in some ways.

Quirks Mode and IE7 Mode (All Versions)

OBJECT elements without a set width and height are recognized as a zero-sized element. As a result, the contents of the OBJECT element will not be rendered.

V0054:

The specification states:

 User agents may render selected frames elements in ways that distinguish them from 
 unselected frames (e.g., by drawing a border around the selected frame).

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

OBJECT elements without a set width and height are recognized as a zero-sized element. As a result, the contents of the OBJECT element will not be rendered.

IE8 Mode and IE9 Mode (All Versions)

When a frame is defined by an OBJECT element loading an HTML document, or when a document has a content-type of text/html, Internet Explorer does not distinguish selected frames from unselected frames.