I try to retype html, I see there is #document inside iframe frame element, and inside #document there is another html,Is it important?
hello and welcome to fcc forum 
- consider reading through this article see if this helps, happy reading https://html.com/tags/iframe/
do i need to type it same as in the picture? or is it just info about src?
Yes writing the html tag below the doctype tag is very important, if you notice the doctype does not have a closing tag but its the html and the html closing tag that mainly controls the affairs of your code
this is about html within html inside iframe element
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