Checks for the use of framesets, which are outdated and bad for SEO.
This check looks for the `<frameset>` or `<iframe>` HTML tags, which are used to display content from other URLs within a page.
Frames are terrible for SEO. They prevent search engines from understanding the page structure, make it impossible for users to bookmark or share a direct link to the content inside the frame, and can create usability issues.
This is a critical issue that severely hinders search engine crawling and indexing. Any site using frames for its main layout needs to be rebuilt with modern web technologies.
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