HTML tags in summary

Here we analyze, which types of HTML tags are allowed inside the summary field.

As the content field, the summary field is described as

A natural language summarization of the object encoded as HTML.

This is a somewhat petulant table as most Fediverse applications treat the summary field as a plain text content warning.

Sanitizing fields is desired behavior as seen in Section B.10 of ActivityPub.

Objects

Object 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/Z7oKMWhhrjM",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<b>bold</b>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 2

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/tO-TXOIjkRY",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<strong>strong</strong>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 3

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/H3ea_t41KY4",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<i>italic</i>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 4

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/Q-lvOBoG-ro",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<i>italic with.</i> See <a href=\"https://codeberg.org/helge/funfedidev/issues/142\">Issue 142</a>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 5

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/CpNDIiVi4TQ",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<em>emphasis</em>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 6

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/VnWR0YU6waU",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<del>old</del><ins>new</ins>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 7

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/Gtk65vSeyL4",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<s>stricken</s>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 8

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/Muukc_fpSvg",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<mark>mark</mark>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 9

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/dff8JOVQ05E",
  "published": "2025-10-12T08:53:00Z",
  "summary": "find <var>x</var> (a variable)",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 10

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/LGfdQsoNuMc",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<ol><li>ordered</li></ol>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 11

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/AOKB_u2mvOs",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<ul><li>unordered</li></ul>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 12

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/_StGTNBSAfk",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<h1>h1</h1>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 13

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/8zUNLwtfIrI",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<h2>h2</h2>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 14

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/My5Vv0q5jxs",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<h3>h3</h3>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 15

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/l3f7jJsT8n8",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<h4>h4</h4>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 16

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/puoM7sniRMQ",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<h5>h5</h5>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 17

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/MNyrOGYS2qM",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<h1>h1</h1><h2>h2</h2>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 18

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/HJeWLkhKZVw",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<code>code</code>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 19

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/ZtBo1-5uN9M",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<pre>pre</pre>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 20

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/aCbBrqkscR4",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<blockquote>blockquote</blockquote>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 21

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/Xzn4jt_VoM4",
  "published": "2025-10-12T08:53:00Z",
  "summary": "line<br/>break",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 22

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/rAyqIV39M3Q",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<p>paragraph</p>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 23

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/KIcYyP3anME",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<small>small</small>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 24

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/MW7YsBixZ5U",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<sup>sup</sup>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 25

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/eW3xSeqdqBo",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<sub>sub</sub>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 26

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/cyVW339b9mI",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<a href='https://funfedi.dev'>funfedi</a>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 27

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/bLKxStwQeqg",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<script>alert('hi');</script>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 28

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/sKhHc0hrfTU",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<img src=\"http://pasture-one-actor/assets/nlnet.png\" alt=\"NLNET Logo\" />",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 29

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/nvtipYyOD2U",
  "published": "2025-10-12T08:53:00Z",
  "summary": "wbr: Fernstra\u00dfen<wbr />bau<wbr />privat<wbr />finanzierungs<wbr />gesetz",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 30

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/TO10oeXw1hs",
  "published": "2025-10-12T08:53:00Z",
  "summary": "Audio <audio controls src=\"http://pasture-one-actor/assets/cow_moo.mp3\"></audio>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 31

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/SfTj-tsPorU",
  "published": "2025-10-12T08:53:00Z",
  "summary": "Video <video controls width=\"250\">\n  <source src=\"http://pasture-one-actor/assets/cow_eating.mp4\" type=\"video/mp4\" />\n  Video of a cow eating</video>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 32

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/unP2fvGXnus",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<dl>\n  <dt>Beast of Bodmin</dt>\n  <dd>A large feline inhabiting Bodmin Moor.</dd>\n</dl>\n",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 33

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/uxNQqisXYsA",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<details>\n  <summary>Details</summary>\n  Something small enough to escape casual notice.\n</details>\n",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 34

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "See summary",
  "id": "http://actor.example/object/pEwnEE9z7NU",
  "published": "2025-10-12T08:53:00Z",
  "summary": "<table><tr><td>HTML tables</td></tr></table>",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Activities

Activity 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/8siOAsOEAA8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/X_ZI7bV3sCQ",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<b>bold</b>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 2

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/Ohl3zB1o4BU",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/_OYW8OvCLQ8",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<strong>strong</strong>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 3

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/OqEu8JrCl2E",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/q2Fh8vREQiU",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<i>italic</i>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 4

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/txSceNkuM4s",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/nl2k1LDDISs",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<i>italic with.</i> See <a href=\"https://codeberg.org/helge/funfedidev/issues/142\">Issue 142</a>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 5

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/IObpTkCQVXg",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/Xd1iNIYvGRM",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<em>emphasis</em>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 6

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/TZRhl_I59pI",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/gI83cOtb4KI",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<del>old</del><ins>new</ins>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 7

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/SpUJaQsKor0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/EpH584nAzEY",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<s>stricken</s>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 8

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/imT7KSDXYn4",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/nVRyl1V6vGo",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<mark>mark</mark>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 9

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/IIcaYTazop8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/2NfbhGKLcgM",
    "published": "2025-10-12T08:53:00Z",
    "summary": "find <var>x</var> (a variable)",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 10

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/KBZ8efR13x8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/peuti8WmwtU",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<ol><li>ordered</li></ol>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 11

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/wevhz74VYns",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/q5YBh83OVwQ",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<ul><li>unordered</li></ul>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 12

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/vA4FmFf-9kA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/o0QZRWoAytM",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<h1>h1</h1>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 13

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/7I5llehBo_U",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/E_iPgol5wwY",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<h2>h2</h2>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 14

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/3sC-hGFalDg",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/eiPMvQTcdBo",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<h3>h3</h3>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 15

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/8Mq6e3ZvD6A",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/qmKAZBQfxaE",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<h4>h4</h4>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 16

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/DTTcRUmotz4",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/YmO2bDt5z5U",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<h5>h5</h5>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 17

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/opGe5f9R078",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/onAbeXinft0",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<h1>h1</h1><h2>h2</h2>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 18

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/0-FKnEu5aLs",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/vGXcFkcvhls",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<code>code</code>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 19

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/u2WFyPMVcUA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/o8q21JkZ4_o",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<pre>pre</pre>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 20

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/_uzagSK4lAU",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/WxP6Q3nVw-E",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<blockquote>blockquote</blockquote>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 21

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/WGy2JXFuBV8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/vSDUv8Zubtk",
    "published": "2025-10-12T08:53:00Z",
    "summary": "line<br/>break",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 22

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/bTd48vILGPQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/x5muoSl37Lo",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<p>paragraph</p>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 23

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/2EmAA-cgltY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/khQM8-8v6xw",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<small>small</small>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 24

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/t6l9NHZFejA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/bJX2hTTupCA",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<sup>sup</sup>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 25

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/DHPz62sA5Rg",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/F3twA5jwiwU",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<sub>sub</sub>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 26

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/jhHOPH_hdKQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/JtlctKkPsCA",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<a href='https://funfedi.dev'>funfedi</a>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 27

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/a8-kgY8cnDA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/R4CmCasiZRY",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<script>alert('hi');</script>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 28

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/YSX4c8My_fY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/oxItwpABHZw",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<img src=\"http://pasture-one-actor/assets/nlnet.png\" alt=\"NLNET Logo\" />",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 29

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/jHsy91KL_Lk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/xUgxT8hZE4s",
    "published": "2025-10-12T08:53:00Z",
    "summary": "wbr: Fernstra\u00dfen<wbr />bau<wbr />privat<wbr />finanzierungs<wbr />gesetz",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 30

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/_7D6531mJW8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/YGgWCwyFoNM",
    "published": "2025-10-12T08:53:00Z",
    "summary": "Audio <audio controls src=\"http://pasture-one-actor/assets/cow_moo.mp3\"></audio>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 31

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/kzpgmLLgNFE",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/TebPACebbUo",
    "published": "2025-10-12T08:53:00Z",
    "summary": "Video <video controls width=\"250\">\n  <source src=\"http://pasture-one-actor/assets/cow_eating.mp4\" type=\"video/mp4\" />\n  Video of a cow eating</video>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 32

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/wZP9q-sPW3Q",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/hAAKX9tSFX0",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<dl>\n  <dt>Beast of Bodmin</dt>\n  <dd>A large feline inhabiting Bodmin Moor.</dd>\n</dl>\n",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 33

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/7dtUJ_McDac",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/lrnYj03QxkY",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<details>\n  <summary>Details</summary>\n  Something small enough to escape casual notice.\n</details>\n",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}

Activity 34

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/WrrifTvIPYA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/Ia9auk-cN1k",
    "published": "2025-10-12T08:53:00Z",
    "summary": "<table><tr><td>HTML tables</td></tr></table>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-12T08:53:00Z",
  "to": [
    "http://remote.example/",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Create"
}