Shows an icon in de addressbar when there is Microdata or JSON-LD on a page.
More information on Microdata:
https://developers.google.com/gmail/actions/reference/formats/microdata
More information on JSON-LD:
https://developers.google.com/gmail/actions/reference/formats/json-ld
谷歌浏览器、其他Chromium内核的浏览器
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