Frame (World Wide Web) (English Wikipedia)

Garaffa, Dave (23 December 1996). "A Present From Apple: Cyberdog 2.0a1" (Press release). Internet.com. Archived from the original on 17 August 2000. Retrieved 14 April 2011.

lewesseo.com

"Connecting to Other Websites". 2 April 2013. What makes framing different is that instead of taking the user to the linked website, the information from that website is imported into the original page and displayed in a special "frame". Technically, when you're viewing framed information, your computer is connected to the site doing the framing—not the site whose page appears in the frame.

"XFrames working draft". W3C.
HTML5 differences from HTML4: "The following elements are not in HTML5 because using them damages usability: frame, frameset, noframes"
HTML5 differences from HTML4: "The iframe element has new attributes called sandbox and srcdoc which allow for sandboxing content, e.g. blog comments."

Garaffa, Dave (23 December 1996). "A Present From Apple: Cyberdog 2.0a1" (Press release). Internet.com. Archived from the original on 17 August 2000. Retrieved 14 April 2011.
Ladd, Eric. "Using HTML 3.2, Java 1.1, and CGI; Ch. 13, Frames". Archived from the original on 30 October 2007.
"Should You Use Frames?". HTML Code Tutorial. Archived from the original on 6 August 2016. Retrieved 7 April 2010.
"G.E.Boyd's How To Do Just About Anything by email – Part 1". GeoCities. 11 August 2000. Archived from the original on 17 August 2000. Retrieved 24 June 2010.