Selector total
<meta name="viewport" content="...">
4,992,791
Starting July 1, 2019, all websites began using Google’s mobile-first index . Lighthouse checks if there is a meta name="viewport" tag at the top of the document, so this meta should be present on every web page, no matter what framework or CMS you use.
Taking the above into account, we would expect that there would be many more sites using a valid meta name="viewport" in the title section than the 4,992,791 out of the 7.5 million indexed pages analyzed.
<meta name="rating" content="...">
Labeling a page as containing adult content means that the page netherlands mobile database has been filtered by SafeSearch results.
Selector total
<meta name="rating" content="...">
133,387
This tag is used to indicate the maturity rating of content. It was not until recently added to the list of meta tags that Google understands. Check out Kate Morris's article on how to mark up adult content .
JSON-LD structured data
Structured data is a standardized format for providing information about a page and categorizing its content. Structured data can be in the form of Microdata, RDFa, and JSON-LD — all of which help Google understand your site’s content and trigger special search result features for your pages.
In this section, we will only collect structured data information using JSON-LD JavaScript Object Notation for Linked Data. This is what Google recommends anyway to provide clues about the meaning of a web page.