when did iframe come out code example

Example: what is iframe

- Iframe is html inside another html
	- We need to switch selenium focus to iframe
	  either by using INDEX, NAME-ID, or 	
	  as a webelement same way as other webelements.
		
  After switching to Iframe we need to switch back to
  the main frame to able to continue in the main frame.
  
  
  Syntax=
  
  -driver.switchTo().defaultContent();
  -driver.switchTo().parentFrame();