Is iframe content respected by search engines?

Question

Search Engine Optimization

Hello! Made an online store. The demo version of the product is shown through an iframe, the file that loads the iframe is on my site. This is a regular html file with all the headings, keywords, etc.
Do the SEs take these keywords, text, etc. into account? for search results?

Answer 1

In principle, all robots already process JS, and even iframes should, even more so.
You can add all iframe html loaders (which with all RIGHT! headers and tags) to the sitemap: sitemap.xml

Answer 2

Globally, this is a shitty decision from any point of view, Alya schoolboy made the site at the beginning of the 2000s

Answer 3

Yandex does not seem to index frames, but Google considers the content of the frame to be the content of the page and indexes everything.
In general, this is too outdated technology that creates many problems. Surely there are other solutions.