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(https://www.w3.org/TR/activitystreams-vocabulary/#dfn-summary) 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/dwuVj6eYaGQ",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<b>bold</b>",
  "to": [
    "as: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/0brc2zEjgp8",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<strong>strong</strong>",
  "to": [
    "as: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/W90VXhYVm1Y",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<i>italic</i>",
  "to": [
    "as: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/ewngHrswopI",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<i>italic with.</i> See <a href=\"https://codeberg.org/helge/funfedidev/issues/142\">Issue 142</a>",
  "to": [
    "as: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/cMycrj3t7fo",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<em>emphasis</em>",
  "to": [
    "as: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/0zXrCDdSxUo",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<del>old</del><ins>new</ins>",
  "to": [
    "as: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/1dBxETSqPyM",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<s>stricken</s>",
  "to": [
    "as: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/H5iqCC_R92o",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<mark>mark</mark>",
  "to": [
    "as: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/sirxIuCJew8",
  "published": "2025-07-31T07:23:46Z",
  "summary": "find <var>x</var> (a variable)",
  "to": [
    "as: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/cReDETo6Q_Y",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<ol><li>ordered</li></ol>",
  "to": [
    "as: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/qytD7-bDhw8",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<ul><li>unordered</li></ul>",
  "to": [
    "as: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/vzfodAznETg",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<h1>h1</h1>",
  "to": [
    "as: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/mHYr58H5acY",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<h2>h2</h2>",
  "to": [
    "as: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/eSjIHhU0sJo",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<h3>h3</h3>",
  "to": [
    "as: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/FXJ2-TPo1MI",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<h4>h4</h4>",
  "to": [
    "as: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/xYo3c1-wOV0",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<h5>h5</h5>",
  "to": [
    "as: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/6ZJXjyJCLHE",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<h1>h1</h1><h2>h2</h2>",
  "to": [
    "as: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/RzDd9jx0hSk",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<code>code</code>",
  "to": [
    "as: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/8xrA1qfmuyQ",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<pre>pre</pre>",
  "to": [
    "as: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/NzXV7JQMZJo",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<blockquote>blockquote</blockquote>",
  "to": [
    "as: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/8-XDfnL6TOE",
  "published": "2025-07-31T07:23:46Z",
  "summary": "line<br/>break",
  "to": [
    "as: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/KYea6Lajk9s",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<p>paragraph</p>",
  "to": [
    "as: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/msID-P-xxAs",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<small>small</small>",
  "to": [
    "as: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/ayP6BPCIo0c",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<sup>sup</sup>",
  "to": [
    "as: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/P5Vd8D92Zso",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<sub>sub</sub>",
  "to": [
    "as: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/74e1qmtQAMM",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<a href='https://funfedi.dev'>funfedi</a>",
  "to": [
    "as: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/KfGXWFvZuHo",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<script>alert('hi');</script>",
  "to": [
    "as: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/XE_Gim0x8Gk",
  "published": "2025-07-31T07:23:46Z",
  "summary": "<img src=\"http://pasture-one-actor/assets/nlnet.png\" alt=\"NLNET Logo\" />",
  "to": [
    "as: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/s54aglKRV4k",
  "published": "2025-07-31T07:23:46Z",
  "summary": "wbr: Fernstra\u00dfen<wbr />bau<wbr />privat<wbr />finanzierungs<wbr />gesetz",
  "to": [
    "as: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/3z0DRqvzN-8",
  "published": "2025-07-31T07:23:46Z",
  "summary": "Audio <audio controls src=\"http://pasture-one-actor/assets/cow_moo.mp3\"></audio>",
  "to": [
    "as: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/WlQQSTbbgCc",
  "published": "2025-07-31T07:23:46Z",
  "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": [
    "as: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/pBUQ_9aOI4Y",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/59tsDl0M3qk",
    "published": "2025-07-31T07:23:46Z",
    "summary": "<b>bold</b>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-31T07:23:46Z",
  "to": [
    "as: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/hFXA4OtkyR4",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/pAbn0zSGJWM",
    "published": "2025-07-31T07:23:46Z",
    "summary": "<strong>strong</strong>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-31T07:23:46Z",
  "to": [
    "as: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/GHtbxhprYUs",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/wUYV34yvtbQ",
    "published": "2025-07-31T07:23:46Z",
    "summary": "<i>italic</i>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-31T07:23:46Z",
  "to": [
    "as: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/9y26o5OdJoE",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/ekaGEBKU_zM",
    "published": "2025-07-31T07:23:46Z",
    "summary": "<i>italic with.</i> See <a href=\"https://codeberg.org/helge/funfedidev/issues/142\">Issue 142</a>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-31T07:23:46Z",
  "to": [
    "as: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/thbX-qHhAk0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/U6su0lUMKVE",
    "published": "2025-07-31T07:23:46Z",
    "summary": "<em>emphasis</em>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-31T07:23:46Z",
  "to": [
    "as: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/Fpw3_Pf5nko",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/W4o1qg-gz_A",
    "published": "2025-07-31T07:23:46Z",
    "summary": "<del>old</del><ins>new</ins>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-31T07:23:46Z",
  "to": [
    "as: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/M_mpJiYwSpY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/zTJ2fW2WeXg",
    "published": "2025-07-31T07:23:46Z",
    "summary": "<s>stricken</s>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-31T07:23:46Z",
  "to": [
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Activity 8

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Activity 14

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Activity 15

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Activity 16

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Activity 17

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Activity 18

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Activity 19

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Activity 20

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Activity 21

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Activity 22

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Activity 23

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Activity 24

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Activity 25

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Activity 26

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Activity 28

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Activity 29

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Activity 30

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Activity 31

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