HTML resource embedding tests

container	content
container	animated SVG	GIF	HTML	plain text	WAV audio	Ogg Vorbis audio
object
object fixed size
img
img fixed size
iframe	alternate content	alternate content	alternate content	alternate content	alternate content	alternate content
iframe fixed size	alternate content	alternate content	alternate content	alternate content	alternate content	alternate content
embed
embed fixed size
audio
audio fixed size
video
video fixed size

Some types of resources that might be interested which are not currently included:

XML documents served as application/xml (XHTML, SVG, and unknown-namespace with or without XSLT).
Video.
MP3 audio.
Flash.
Resources from a different domain.
Resources subject to content sniffing confusion.