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HTML tags

Here we analyze, which types of HTML tags are allowed inside the content field. Sanitizing fields is desired behavior as seen in Section B.10 of ActivityPub.

Due to firefish using markdown to format their content, the displayed result in the details table can be a bit off, please consult the example.

Objects

Object 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "<b>bold</b>",
  "id": "http://actor.example/yyKQupwDJ8c",
  "published": "2025-03-07T11:42:22Z",
  "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": "<strong>strong</strong>",
  "id": "http://actor.example/ddGrqgZEFU0",
  "published": "2025-03-07T11:42:22Z",
  "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": "<i>italic</i>",
  "id": "http://actor.example/AOBp3jM_HuU",
  "published": "2025-03-07T11:42:22Z",
  "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": "<i>italic with.</i> See <a href=\"https://codeberg.org/helge/funfedidev/issues/142\">Issue 142</a>",
  "id": "http://actor.example/If064d7m_Jw",
  "published": "2025-03-07T11:42:22Z",
  "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": "<em>emphasis</em>",
  "id": "http://actor.example/weP_wuqK8cg",
  "published": "2025-03-07T11:42:22Z",
  "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": "<del>old</del><ins>new</ins>",
  "id": "http://actor.example/dWCS86hoFPU",
  "published": "2025-03-07T11:42:22Z",
  "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": "<s>stricken</s>",
  "id": "http://actor.example/QY9mm8BSvVE",
  "published": "2025-03-07T11:42:22Z",
  "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": "<mark>mark</mark>",
  "id": "http://actor.example/xxxZUxBgA6o",
  "published": "2025-03-07T11:42:22Z",
  "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": "find <var>x</var> (a variable)",
  "id": "http://actor.example/H8mDwQGyn6I",
  "published": "2025-03-07T11:42:22Z",
  "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": "<ol><li>ordered</li></ol>",
  "id": "http://actor.example/rcE-a5Gs6e8",
  "published": "2025-03-07T11:42:22Z",
  "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": "<ul><li>unordered</li></ul>",
  "id": "http://actor.example/sAFrYaxwTuE",
  "published": "2025-03-07T11:42:22Z",
  "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": "<h1>h1</h1>",
  "id": "http://actor.example/Q_ZKZjraOvY",
  "published": "2025-03-07T11:42:22Z",
  "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": "<h2>h2</h2>",
  "id": "http://actor.example/s61F66DfF9I",
  "published": "2025-03-07T11:42:22Z",
  "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": "<h3>h3</h3>",
  "id": "http://actor.example/S-VyfZpTkeo",
  "published": "2025-03-07T11:42:22Z",
  "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": "<h4>h4</h4>",
  "id": "http://actor.example/SRNI-Qi8xiQ",
  "published": "2025-03-07T11:42:22Z",
  "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": "<h5>h5</h5>",
  "id": "http://actor.example/Gen_Dab4pKY",
  "published": "2025-03-07T11:42:22Z",
  "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": "<h1>h1</h1><h2>h2</h2>",
  "id": "http://actor.example/xjzVK7veF0U",
  "published": "2025-03-07T11:42:22Z",
  "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": "<code>code</code>",
  "id": "http://actor.example/WmJrlTM9-Jw",
  "published": "2025-03-07T11:42:22Z",
  "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": "<pre>pre</pre>",
  "id": "http://actor.example/EGu2dBTcfD8",
  "published": "2025-03-07T11:42:22Z",
  "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": "<blockquote>blockquote</blockquote>",
  "id": "http://actor.example/i5LSFJ41Bhk",
  "published": "2025-03-07T11:42:22Z",
  "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": "line<br/>break",
  "id": "http://actor.example/rStugNMLzio",
  "published": "2025-03-07T11:42:22Z",
  "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": "<p>paragraph</p>",
  "id": "http://actor.example/8xXxGCqwRCs",
  "published": "2025-03-07T11:42:22Z",
  "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": "<small>small</small>",
  "id": "http://actor.example/rM5eQnydulU",
  "published": "2025-03-07T11:42:22Z",
  "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": "<sup>sup</sup>",
  "id": "http://actor.example/5DqWHP_TAd0",
  "published": "2025-03-07T11:42:22Z",
  "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": "<sub>sub</sub>",
  "id": "http://actor.example/OB3fPySYmHg",
  "published": "2025-03-07T11:42:22Z",
  "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": "<a href='https://funfedi.dev'>funfedi</a>",
  "id": "http://actor.example/mtNWMhlyx7s",
  "published": "2025-03-07T11:42:22Z",
  "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": "<script>alert('hi');</script>",
  "id": "http://actor.example/jgfmIdATOY8",
  "published": "2025-03-07T11:42:22Z",
  "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": "<img src=\"http://pasture-one-actor/assets/nlnet.png\" alt=\"NLNET Logo\" />",
  "id": "http://actor.example/l-bqEeigqlo",
  "published": "2025-03-07T11:42:22Z",
  "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": "wbr: Fernstra\u00dfen<wbr />bau<wbr />privat<wbr />finanzierungs<wbr />gesetz",
  "id": "http://actor.example/eFCloo4q0VM",
  "published": "2025-03-07T11:42:22Z",
  "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": "Audio <audio controls src=\"http://pasture-one-actor/assets/cow_moo.mp3\"></audio>",
  "id": "http://actor.example/zs85XdNLlI8",
  "published": "2025-03-07T11:42:22Z",
  "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": "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>",
  "id": "http://actor.example/fiZExIIyfNc",
  "published": "2025-03-07T11:42:22Z",
  "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/sBRW3E-zADc",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<b>bold</b>",
    "id": "http://actor.example/yxxTzY4V29c",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as: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/K-Zd4EQmc2Y",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<strong>strong</strong>",
    "id": "http://actor.example/8CPbyVFnN3g",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as: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/XbvWrAoRrdU",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<i>italic</i>",
    "id": "http://actor.example/rOsFNlO6Jcg",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as: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/3OGkn2c2ToU",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<i>italic with.</i> See <a href=\"https://codeberg.org/helge/funfedidev/issues/142\">Issue 142</a>",
    "id": "http://actor.example/C3jCSUevPc4",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as: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/Z3lAv9OPH2M",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<em>emphasis</em>",
    "id": "http://actor.example/OehKLfQFPHg",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as: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/nIl3uGACR-0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<del>old</del><ins>new</ins>",
    "id": "http://actor.example/BY6ga6WZoDY",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as: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/_pB5LfRky4s",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<s>stricken</s>",
    "id": "http://actor.example/GFGMLjDqeD4",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as: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/JQ8T-I7gns0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<mark>mark</mark>",
    "id": "http://actor.example/3maqDL8eF2Y",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}

Activity 9

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
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