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HTML tags for article

Here we analyze, which types of HTML tags are allowed inside the content field of Article type objects. One should expect that a Note, i.e.

Represents a short written work typically less than a single paragraph in length.

see here, should not contain headings h1-h6 or embedded media, e.g. img.

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": "<b>bold</b>",
  "id": "http://actor.example/76_8txXoUZE",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/KsNVOLr44PI",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/uwDqaYQkWYI",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/4ye1nZEIa5o",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/nTu_33LF8Lw",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/EWR54j0hjN0",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/IoMf_S6eyPc",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/M74xauiD3ck",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/E8WIpxWsSmM",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/QAzSXnB6lmk",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/Q9_9SMN7F6I",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/rYuaVJlB7hI",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/UnUG0TYquKE",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/pYC87Sd6LVw",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/8sInS8eiBsA",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/zhbzfLhPLeI",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/gakU6uWTAuA",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/6aik3rlaCc8",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/owDWNUNM89w",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 20

{
  "@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/IOUAivp1_jU",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 21

{
  "@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/pwINATF8Ny0",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 22

{
  "@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/4PcLEzASBWc",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 23

{
  "@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/KfCUhMpI3V8",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 24

{
  "@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/XSn3cFRdiuo",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 25

{
  "@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/Dg94VelwRGM",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 26

{
  "@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/RLooIxF1eJQ",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 27

{
  "@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/JpKtc3ZcWF4",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 28

{
  "@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/5wZV5TcTfXA",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 29

{
  "@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/-GjF_jqWYIU",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Object 30

{
  "@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/7QLKFjg2SLU",
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

Activities

Activity 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/CEQoCKTRkIs",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<b>bold</b>",
    "id": "http://actor.example/WWv4FpG5uSs",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "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/eQhhOEHKISM",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<strong>strong</strong>",
    "id": "http://actor.example/0nJEUh906VU",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "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/36Y5ZllggOw",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<i>italic</i>",
    "id": "http://actor.example/ljH2w7FJNoU",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "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/8adhClblo6Q",
  "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/nwAOlqyp8bU",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "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/9Loo2rxeEqo",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<em>emphasis</em>",
    "id": "http://actor.example/TIvJvm1cTgA",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "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/4vJ_sSOXOfM",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<del>old</del><ins>new</ins>",
    "id": "http://actor.example/8XvqWdLXa-8",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "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/p5XRjB443NY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<s>stricken</s>",
    "id": "http://actor.example/hZs65qLAp1E",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as: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/9qgI3Q_QCIY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<mark>mark</mark>",
    "id": "http://actor.example/eGd2BP2oYq4",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "to": [
    "as: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/6zoPZchilAg",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "find <var>x</var> (a variable)",
    "id": "http://actor.example/qdUBY_C-Kwo",
    "published": "2025-01-13T19:51:01Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "published": "2025-01-13T19:51:01Z",
  "to": [
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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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Activity 30

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