html can go anywhere between the <body></body> tags, where you want the code to run.
Other code, like javascript, may have one link to the script in the <head> section, and the code to run the script in the <body>.
A modern webpage is in 2 parts, the content and the layout.
The content is html or a script/program creating dynamic html content.
and the layout is in CSS (Cascading Style Sheet).
I'm guessing that the website using the term Layout means the body of the page. Unless it's not html code, maybe css or java, or php ...
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