Message: The name "xxx" specified by the "name" attribute is not a recognized metadata name.

[Albert Wiersch]

If you get a message like this:

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The name "summary" specified by the "name" attribute is not a recognized metadata name.

for a meta tag like this:

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<meta name="summary" content="this is summary text">

Then these links may be useful:

• HTML Standard: Standard metadata names
• whatwg.org: MetaExtensions
• mdn: Standard metadata names
• meta tags and attributes that Google supports

It is recommended that you use recognized metadata names. If the metadata name has no known use then consider removing the tag entirely to remove unnecessary page weight and bloat.