<iframe> operation

I'm still looking for examples of <iframe> operation.
Following is a list and expected results.
Not complete list, or maybe even correct, and not all needed 
combinations, and nothing for new @srcdoc.

Seamless
 no seamless - browser default actrion makes iframe content 
identifiable
 seamless - no browser action to make iframe content identifiable

Sandbox
 nosandbox - anchor in iframe replaces document
 sandbox - anchor in iframe replaces iframe

 no sandbox - external urls available (css, img, script, etc loaded)
 sandbox - no external urls available (css, img, script, etc not 
loaded)
 sandbox='allow-same-origin' - absolute same origin urls allowed

 no sandbox - iframe script to change iframe works
 sandbox - iframe script to change iframe fails
 sandbox='allow-scripts' - iframe script to change iframe works

 no sandbox - iframe script to change host works
 sandbox - iframe script to change host fails
 sandbox='allow-scripts' - iframe script to change host fails

 no sandbox - form in iframe works
 sandbox - form in iframe fails
 sandbox='allow-forms' - form in iframe works

basic: no scripted window.open()
child iframes inherit parent iframe sandbox

Thanks and Best Regards,
Joe