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/InMiJEOUD9s",
  "published": "2025-09-09T09:32:38Z",
  "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/LjEulrJMK0g",
  "published": "2025-09-09T09:32:38Z",
  "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/taLY9B0u3qE",
  "published": "2025-09-09T09:32:38Z",
  "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/UcdzecP0qFs",
  "published": "2025-09-09T09:32:38Z",
  "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/xUdo9J7HS0c",
  "published": "2025-09-09T09:32:38Z",
  "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/7qzLDbMTCrE",
  "published": "2025-09-09T09:32:38Z",
  "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/4HmeK-VXTQc",
  "published": "2025-09-09T09:32:38Z",
  "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/pgRh8dMcYrM",
  "published": "2025-09-09T09:32:38Z",
  "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/hQLrpogalmo",
  "published": "2025-09-09T09:32:38Z",
  "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/lZGpz6Kyo4Q",
  "published": "2025-09-09T09:32:38Z",
  "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/wxvrJcLwALM",
  "published": "2025-09-09T09:32:38Z",
  "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/F86V_QOVnVI",
  "published": "2025-09-09T09:32:38Z",
  "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/DO9PNTQpCTI",
  "published": "2025-09-09T09:32:38Z",
  "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/CDDAj9e-lp4",
  "published": "2025-09-09T09:32:38Z",
  "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/C3x23ed8TFI",
  "published": "2025-09-09T09:32:38Z",
  "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/EryJ6TA0GXk",
  "published": "2025-09-09T09:32:38Z",
  "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/1iYTFKeTxrk",
  "published": "2025-09-09T09:32:38Z",
  "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/ievMW5jPUxQ",
  "published": "2025-09-09T09:32:38Z",
  "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/7yGFyeNpE3M",
  "published": "2025-09-09T09:32:38Z",
  "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/Np8QorXaoG0",
  "published": "2025-09-09T09:32:38Z",
  "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/KOO7XLnmaic",
  "published": "2025-09-09T09:32:38Z",
  "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/y--dKPHK7IU",
  "published": "2025-09-09T09:32:38Z",
  "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/JEJ6-0DzrfM",
  "published": "2025-09-09T09:32:38Z",
  "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/PGxCjorcBu0",
  "published": "2025-09-09T09:32:38Z",
  "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/xWj1hKGhkd4",
  "published": "2025-09-09T09:32:38Z",
  "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/VUYEmZ9_f-4",
  "published": "2025-09-09T09:32:38Z",
  "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/ZSbxxl-nXFM",
  "published": "2025-09-09T09:32:38Z",
  "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/vMCwRa_2lIg",
  "published": "2025-09-09T09:32:38Z",
  "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/VApFjkMLuVI",
  "published": "2025-09-09T09:32:38Z",
  "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/f_GDN5GwFFY",
  "published": "2025-09-09T09:32:38Z",
  "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/ZsaPeuu8R3A",
  "published": "2025-09-09T09:32:38Z",
  "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/vHsm8PCq2T0",
  "published": "2025-09-09T09:32:38Z",
  "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/uqECX7Nj6pY",
  "published": "2025-09-09T09:32:38Z",
  "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/ORhwI2Ijbko",
  "published": "2025-09-09T09:32:38Z",
  "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/yzt8H0mqrRA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/2Lsg1Zwkrlw",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<b>bold</b>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/hJ0tAtJRqX8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/J0PAHX4vf_g",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<strong>strong</strong>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/DgHBALnRkgU",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/dQWgpwNEc8k",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<i>italic</i>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/zVfFghugcbs",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/fUsQ6YgIE3Y",
    "published": "2025-09-09T09:32:38Z",
    "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": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/IFQgXjVVsrk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/_SSHN5-YuJw",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<em>emphasis</em>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/hz6iPPtgaeQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/e9Omf9ON6TA",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<del>old</del><ins>new</ins>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/aCa5SfHSbnQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/8Wk9pkO2y-E",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<s>stricken</s>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/bgPhq-grv9U",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/8t37dehj4p8",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<mark>mark</mark>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/Csg6oKqNRuo",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/6T1Fdh3klgo",
    "published": "2025-09-09T09:32:38Z",
    "summary": "find <var>x</var> (a variable)",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/PUlWZuN3_rw",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/f6OZlvuLUjI",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<ol><li>ordered</li></ol>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/fmEEnfuHqow",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/-tzjCFoe_Mg",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<ul><li>unordered</li></ul>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/LrYREj3N0Ss",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/5d16d5Lz_4Y",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<h1>h1</h1>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/p1mBG9BdeKA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/1_zR7DeGG3Y",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<h2>h2</h2>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/Hsv9l6OBrNU",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/cbUzA8MQmnA",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<h3>h3</h3>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/3PlAacEwXdk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/tNc-E6zZKNU",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<h4>h4</h4>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/celYBjXFOgw",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/AqoSZru-GUw",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<h5>h5</h5>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/77Xj5BCdMjY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/dRtMallFRkE",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<h1>h1</h1><h2>h2</h2>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/zK7D4hGGZ6k",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/4joSmUwMvrQ",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<code>code</code>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/ZEgIJ8D9wY0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/t8tSzbQu0Bw",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<pre>pre</pre>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/csAbbuzf4IY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/jP9MzdDdDhw",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<blockquote>blockquote</blockquote>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/bQMxI2EOGe4",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/dPnjruNgDtw",
    "published": "2025-09-09T09:32:38Z",
    "summary": "line<br/>break",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/zo1Ap3W48CQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/MQdgUBE6wKo",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<p>paragraph</p>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/wct60HYopV8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/f6PfPw9K5B8",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<small>small</small>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/sHYj67Ae_-s",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/BsIK9OSZbWM",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<sup>sup</sup>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/hA4gOdmGYJg",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/1ML-c1WSC7I",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<sub>sub</sub>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/w8JfORg3OaY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/mx5lutkOEx8",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<a href='https://funfedi.dev'>funfedi</a>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/0Y8ZsRlZeuw",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/XRraqb1-wI4",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<script>alert('hi');</script>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/dtqdxZrjTOU",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/KjXj5OKv0gg",
    "published": "2025-09-09T09:32:38Z",
    "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": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/Q5Y9H-X6gFk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/2j56AUFZF9A",
    "published": "2025-09-09T09:32:38Z",
    "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": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/N4_n02njlds",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/Gd0PBQKKtiM",
    "published": "2025-09-09T09:32:38Z",
    "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": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/npbcuGWxclo",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/4ve5JTrT-AQ",
    "published": "2025-09-09T09:32:38Z",
    "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": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/Fymc_pIcfsw",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/dvxfS9BmTG0",
    "published": "2025-09-09T09:32:38Z",
    "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": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/u8J2ODbA-qY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/JV7BogaY6-0",
    "published": "2025-09-09T09:32:38Z",
    "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": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "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/n6G3ph42Nbg",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/object/81y2RoOMWJk",
    "published": "2025-09-09T09:32:38Z",
    "summary": "<table><tr><td>HTML tables</td></tr></table>",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-09-09T09:32:38Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "type": "Create"
}