Closed iframe:
Inside the iframe I'm safe from the world. Good place to hide extra search engine stuff, or secret messages?
AAAAAAAAAAAA
Not closed iframe: has BBBBBBBBBBBBBBB which doesn't show, in fact everything after this unclosed iframe disappears...
<span>BBBBBBBBBBBBBBBBBB</span> </div> <hr> <div style="background-color:darksalmon; float: left; width: 80vw; display: block;"> <h1>Self closed iframe:</h1> <iframe src="iview.html" scrolling="auto" frameborder="0" marginheight="0" marginwidth="0" /> <span>CCCCCCCCCCCCCCCCCC</span> </div> </body> </html>