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When it comes to building a web page using other pages iframe is one of the simplest options, but studying on the subject I discovered that they are not recommended because search engines or screen readers ignore their content when they go through the frame.
Another way to build a page using others would be using php include, but then the same question arises: when a search engine or screen reader goes through include, it reads the contents of the page/file or also ignores?
This answers your question? Include HTML in HTML without affecting SEO
– hugocsl