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Yes, they are allowed in the meta description tag. They are valid HTML entities and will be handled and displayed correctly by search engines.


Unless something is wrong on Google’s side, they’ll display & as & if used in HTML. (Note that in HTML5 you don’t have to encode the ampersand in your specific example, because it’s not ambiguous.)


What you're looking for is setting a header value for Vary. The following PHP example will add a header value for: Vary: Mozilla/1.22 (compatible; MSIE 5.01; PalmOS 3.0) EudoraWeb 2 <?php $httpRequest->setHeaders(array('Vary' => 'Mozilla/1.22 (compatible; MSIE 5.01; PalmOS 3.0) EudoraWeb 2')); ?> You will want to use PHP's ...


(My answer from your cross-posted (and now closed) question.) Google shows your meta-description if they think it’s useful for the searching user. See Google’s documentation (bold emphasis mine): Google will sometimes use the meta description of a page in search results snippets, if we think it gives users a more accurate description than would be ...


This is by design and is how Google works. It does not necessarily use the meta description in the SERPs if it thinks other text on the page is more relevant to what the user has searched for.

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