XHTML, eXtensible HyperText Markup Language, is an application of HTML that is also a valid XML document, as opposed to standard HTML which is based on SGML. It is a markup language commonly used for webpages.

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Why doesn't <link rel=“alternate” … /> work with <base href=“…” /> in structured testing tool?

Is there any good reason why using <base href="https://example.com/"/> causes structured data testing tool (SDTT) errors to fly from alternate links such as <link rel="alternate" ...