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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/Wc0ZC41fpnw",
  "published": "2025-03-07T11:42:22Z",
  "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/D0fgW6wqB04",
  "published": "2025-03-07T11:42:22Z",
  "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/ur7oYTUwIPs",
  "published": "2025-03-07T11:42:22Z",
  "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/svuh-Ha88Ls",
  "published": "2025-03-07T11:42:22Z",
  "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/Go4ax8KF8WY",
  "published": "2025-03-07T11:42:22Z",
  "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/t_eanC_cL0U",
  "published": "2025-03-07T11:42:22Z",
  "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/cYPp_wMLjcs",
  "published": "2025-03-07T11:42:22Z",
  "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/XV3Koxl7OPQ",
  "published": "2025-03-07T11:42:22Z",
  "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/abdG8q35c_Q",
  "published": "2025-03-07T11:42:22Z",
  "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/faTOlwocKVA",
  "published": "2025-03-07T11:42:22Z",
  "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/03C_FXR7o7g",
  "published": "2025-03-07T11:42:22Z",
  "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/LnWLWkW7NbE",
  "published": "2025-03-07T11:42:22Z",
  "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/0KHQFxU_ErM",
  "published": "2025-03-07T11:42:22Z",
  "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/it6J983SJA4",
  "published": "2025-03-07T11:42:22Z",
  "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/z0NJqomQmO0",
  "published": "2025-03-07T11:42:22Z",
  "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/rBZccQS2QlE",
  "published": "2025-03-07T11:42:22Z",
  "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/DWk3Q_SUJl0",
  "published": "2025-03-07T11:42:22Z",
  "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/lzL-VOxkrU4",
  "published": "2025-03-07T11:42:22Z",
  "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/SWC2K1VbHN0",
  "published": "2025-03-07T11:42:22Z",
  "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": "<blockquote>blockquote</blockquote>",
  "id": "http://actor.example/BNKqVj1bBOQ",
  "published": "2025-03-07T11:42:22Z",
  "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": "line<br/>break",
  "id": "http://actor.example/9mL-Zw_8pqY",
  "published": "2025-03-07T11:42:22Z",
  "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": "<p>paragraph</p>",
  "id": "http://actor.example/89DQH1rxfHY",
  "published": "2025-03-07T11:42:22Z",
  "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": "<small>small</small>",
  "id": "http://actor.example/nIMChnW7Hss",
  "published": "2025-03-07T11:42:22Z",
  "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": "<sup>sup</sup>",
  "id": "http://actor.example/8f02yHYggy4",
  "published": "2025-03-07T11:42:22Z",
  "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": "<sub>sub</sub>",
  "id": "http://actor.example/3XtIzn9sUWI",
  "published": "2025-03-07T11:42:22Z",
  "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": "<a href='https://funfedi.dev'>funfedi</a>",
  "id": "http://actor.example/73tVZEteLIU",
  "published": "2025-03-07T11:42:22Z",
  "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": "<script>alert('hi');</script>",
  "id": "http://actor.example/XpHPC2rEeA8",
  "published": "2025-03-07T11:42:22Z",
  "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": "<img src=\"http://pasture-one-actor/assets/nlnet.png\" alt=\"NLNET Logo\" />",
  "id": "http://actor.example/xha9H1eO_XA",
  "published": "2025-03-07T11:42:22Z",
  "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": "wbr: Fernstra\u00dfen<wbr />bau<wbr />privat<wbr />finanzierungs<wbr />gesetz",
  "id": "http://actor.example/pCftl_qodfY",
  "published": "2025-03-07T11:42:22Z",
  "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": "Audio <audio controls src=\"http://pasture-one-actor/assets/cow_moo.mp3\"></audio>",
  "id": "http://actor.example/Eojd2xm_zNM",
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "as:Public"
  ],
  "type": "Article"
}

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/C5aacRJ5o0k",
  "published": "2025-03-07T11:42:22Z",
  "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/bHiIp0iq4Rc",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<b>bold</b>",
    "id": "http://actor.example/qAQ9iXw7-5g",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "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/HzvOD1wrQbk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<strong>strong</strong>",
    "id": "http://actor.example/rS-94oX2NKw",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "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/gPaftOCZQD8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<i>italic</i>",
    "id": "http://actor.example/8Kx1ZVbD6No",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "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/-AHz9Az3DLM",
  "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/Gip6avpWa9I",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "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/929opgs_mCs",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<em>emphasis</em>",
    "id": "http://actor.example/tU6CKYb92wI",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "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/Yxof6AFec6Y",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<del>old</del><ins>new</ins>",
    "id": "http://actor.example/5hW-51iDFfE",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "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/Ek5favYEGhM",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<s>stricken</s>",
    "id": "http://actor.example/gF7uWeMRbSE",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "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/61rWrp3_pSo",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<mark>mark</mark>",
    "id": "http://actor.example/WPiEDVHVRyc",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Article"
  },
  "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"
    }
  ],
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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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Activity 31

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