Tagged “metadata”
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HTML, markdown, and your page's other machine reader
A preview crawler reads your head and ignores the body. An agent fetching your page does the opposite. What survives each, and what to do about it.
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What a preview crawler actually reads
One GET, the first few kilobytes of your head, a dozen meta tags, then a second request for the image. Everything a card shows has to survive that.
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og:type and the metadata around it
The tag that tells platforms what kind of thing your page is, plus the site name, locale and article tags that do slightly less than people expect.