link-preview-brainstorming

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This is part of an effort to define a standard link-preview microformat.

previous related work

proposals

General approaches:

publishing

  • In general: use h-entry on the <body> element with a few additions like u-photo, u-audio, u-video
  • Use h-card for pages of people or organizations,
  • h-product for product pages
  • (or whatever top level object the page represents)

parsing

Using a microformats2 parser, look for the first h-* on the page and use its:

  • p-name (called "title" in some other approaches)
  • p-summary (called "description" in some other approaches)
  • u-url
  • u-photo (called "image" in some other approaches)
  • u-audio
  • u-video

Existing link preview schemes allow differentiating the "page name" from the "site name," such as OpenGraph's og:site_name/og:title and Twitter Cards's twitter:domain/twitter:title. Is this worth investigating?

  • The <title> element usually features both, and sometimes a tagline. It's invalid to nest tags inside of it, so breaking it down is probably a bad idea.
  • The actual "domain name" should be easily computable, but the site name is often different. For example, multiple word names.
  • The site name is usually marked up in a nice heading somewhere, so it should be trivial to attach another class name to it.
  • A "site microformat" may scratch the itch of those who like putting up invisible rel=author and similar data, allow for explicit site-wide legal disclaimers vs. page-level (like Tumblr's policies vs. the content its users copyright on their blogs on a tumblr subdomain), site-wide tags/categories, and other various publisher vs. author distinctions.

Examples in the wild

Examples on the web of pages with h-entry on body:

see also