New Semantic Meta Tags 3.0+ feature

This is a test page. Refs: https://github.com/SemanticMediaWiki/SemanticMetaTags/blob/master/docs/README.md#advanced-settings

result without a direct annotation

<meta name="description" content="20200921. De Semantic MediaWiki - Sandbox"/>

result with a direct annotation and fallback usage

<meta name="description" content="This is a test description"/>

result with a direct annotation and without fallback usage

<meta name="description" content="This is a test description,20200921. De Semantic MediaWiki - Sandbox"/>