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/hhtBwWspNr8",
  "published": "2025-07-15T09:07:23Z",
  "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/b4JQCzo_OjA",
  "published": "2025-07-15T09:07:23Z",
  "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/SQuVnKW3aqM",
  "published": "2025-07-15T09:07:23Z",
  "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/JjDZgugbudY",
  "published": "2025-07-15T09:07:23Z",
  "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/waW_KRAXgTc",
  "published": "2025-07-15T09:07:23Z",
  "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/HEeJOjko1ZQ",
  "published": "2025-07-15T09:07:23Z",
  "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/gcOC0t0FHdI",
  "published": "2025-07-15T09:07:23Z",
  "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/JxQ8z66Sftw",
  "published": "2025-07-15T09:07:23Z",
  "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/OITpTblofoE",
  "published": "2025-07-15T09:07:23Z",
  "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/CuEIywYrmlQ",
  "published": "2025-07-15T09:07:23Z",
  "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/F_XQc7TA8io",
  "published": "2025-07-15T09:07:23Z",
  "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/47JEuHoSMv4",
  "published": "2025-07-15T09:07:23Z",
  "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/qnO0M-j7bec",
  "published": "2025-07-15T09:07:23Z",
  "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/0JaYG0ak43Q",
  "published": "2025-07-15T09:07:23Z",
  "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/ifO9tdxrL_g",
  "published": "2025-07-15T09:07:23Z",
  "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/9tyc8KAW_EE",
  "published": "2025-07-15T09:07:23Z",
  "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/7KH83wXqz3Q",
  "published": "2025-07-15T09:07:23Z",
  "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/8_44vhTS_CY",
  "published": "2025-07-15T09:07:23Z",
  "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/kAPg3qQmCQM",
  "published": "2025-07-15T09:07:23Z",
  "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/-87dPEb2frQ",
  "published": "2025-07-15T09:07:23Z",
  "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/nKUmRiLbEqg",
  "published": "2025-07-15T09:07:23Z",
  "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/rKWTsRN108Q",
  "published": "2025-07-15T09:07:23Z",
  "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/uRSYj8Y9SSM",
  "published": "2025-07-15T09:07:23Z",
  "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/7ZFg-SeBMpA",
  "published": "2025-07-15T09:07:23Z",
  "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/cQ2rkD4n5-w",
  "published": "2025-07-15T09:07:23Z",
  "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/BKLeh5b_ZKk",
  "published": "2025-07-15T09:07:23Z",
  "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/IsPcKToZnzo",
  "published": "2025-07-15T09:07:23Z",
  "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/tghFO2lTz7k",
  "published": "2025-07-15T09:07:23Z",
  "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/oTZRi4vshWU",
  "published": "2025-07-15T09:07:23Z",
  "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/qVYrPn48UWM",
  "published": "2025-07-15T09:07:23Z",
  "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/UFX-ilLTCPE",
  "published": "2025-07-15T09:07:23Z",
  "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/EBDXCoGlXSI",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/9VjHCGSZBiQ",
    "published": "2025-07-15T09:07:23Z",
    "summary": "<b>bold</b>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "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/BCEnmjf5Gl0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/dWPXVsQVFr8",
    "published": "2025-07-15T09:07:23Z",
    "summary": "<strong>strong</strong>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "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/-nAEUg-6eYM",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/1t47HrTezx4",
    "published": "2025-07-15T09:07:23Z",
    "summary": "<i>italic</i>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "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/g8AvjXDfITU",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/wuKCoV4sJdE",
    "published": "2025-07-15T09:07:23Z",
    "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": "2025-07-15T09:07:23Z",
  "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/Kf9uX8lOZLI",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/pHedwn2hX7k",
    "published": "2025-07-15T09:07:23Z",
    "summary": "<em>emphasis</em>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "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/Tam8Aw3r8VI",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/AnTstkrRHKk",
    "published": "2025-07-15T09:07:23Z",
    "summary": "<del>old</del><ins>new</ins>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "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/CRxY9_q5o6c",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "See summary",
    "id": "http://actor.example/OuvVVTsRf_s",
    "published": "2025-07-15T09:07:23Z",
    "summary": "<s>stricken</s>",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
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Activity 8

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Activity 9

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Activity 10

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Activity 11

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Activity 12

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Activity 13

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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 27

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Activity 28

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Activity 29

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    "published": "2025-07-15T09:07:23Z",
    "summary": "wbr: Fernstra\u00dfen<wbr />bau<wbr />privat<wbr />finanzierungs<wbr />gesetz",
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Activity 30

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Activity 31

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