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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.

Examples

Example 1

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/V5J9xY6k_Ik",
  "published": "2025-03-12T10:44:55Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/hhjRsxlOKKQ",
    "published": "2025-03-12T10:44:55Z",
    "summary": "<b>bold</b>",
    "content": "See summary"
  }
}

Example 2

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/J8MqP6h5UQM",
  "published": "2025-03-12T10:45:06Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/lcMpse6rzFo",
    "published": "2025-03-12T10:45:06Z",
    "summary": "<strong>strong</strong>",
    "content": "See summary"
  }
}

Example 3

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/oDVCTAKnsz8",
  "published": "2025-03-12T10:45:16Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/emuLc6r_p6c",
    "published": "2025-03-12T10:45:16Z",
    "summary": "<i>italic</i>",
    "content": "See summary"
  }
}

Example 4

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/tWMdnAWKKKU",
  "published": "2025-03-12T10:45:27Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/iAVfIqFqbP4",
    "published": "2025-03-12T10:45:27Z",
    "summary": "<i>italic with.</i> See <a href=\"https://codeberg.org/helge/funfedidev/issues/142\">Issue 142</a>",
    "content": "See summary"
  }
}

Example 5

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/9_0b_eOz4Gg",
  "published": "2025-03-12T10:45:38Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/O81_gDVDliQ",
    "published": "2025-03-12T10:45:38Z",
    "summary": "<em>emphasis</em>",
    "content": "See summary"
  }
}

Example 6

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/kdTTWCvwOUc",
  "published": "2025-03-12T10:45:49Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/JhzVTsIYmhs",
    "published": "2025-03-12T10:45:49Z",
    "summary": "<del>old</del><ins>new</ins>",
    "content": "See summary"
  }
}

Example 7

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/3Fbt8QlkHZY",
  "published": "2025-03-12T10:45:59Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/tOicO8xdu1Y",
    "published": "2025-03-12T10:45:59Z",
    "summary": "<s>stricken</s>",
    "content": "See summary"
  }
}

Example 8

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/2kIvDFPHXrU",
  "published": "2025-03-12T10:46:10Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/kd4kivYKbmY",
    "published": "2025-03-12T10:46:10Z",
    "summary": "<mark>mark</mark>",
    "content": "See summary"
  }
}

Example 9

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/cOGrtvFSnqQ",
  "published": "2025-03-12T10:46:21Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/udC1S_HQKpU",
    "published": "2025-03-12T10:46:21Z",
    "summary": "find <var>x</var> (a variable)",
    "content": "See summary"
  }
}

Example 10

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/IOVwYlI-e-s",
  "published": "2025-03-12T10:46:32Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/9-_tyn0oJvM",
    "published": "2025-03-12T10:46:32Z",
    "summary": "<ol><li>ordered</li></ol>",
    "content": "See summary"
  }
}

Example 11

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/Mi4fBEWonds",
  "published": "2025-03-12T10:46:42Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/mOlcdGg2nJU",
    "published": "2025-03-12T10:46:42Z",
    "summary": "<ul><li>unordered</li></ul>",
    "content": "See summary"
  }
}

Example 12

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/EDEWm2C9rMc",
  "published": "2025-03-12T10:46:53Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/vNY5TOe5vdY",
    "published": "2025-03-12T10:46:53Z",
    "summary": "<h1>h1</h1>",
    "content": "See summary"
  }
}

Example 13

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/2Cq8bEcAbUM",
  "published": "2025-03-12T10:47:04Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/08qZPV1M9OA",
    "published": "2025-03-12T10:47:04Z",
    "summary": "<h2>h2</h2>",
    "content": "See summary"
  }
}

Example 14

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/LmgWOCU7rkM",
  "published": "2025-03-12T10:47:15Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/WB3zw7P3tMg",
    "published": "2025-03-12T10:47:15Z",
    "summary": "<h3>h3</h3>",
    "content": "See summary"
  }
}

Example 15

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/qWIzXl8S79Q",
  "published": "2025-03-12T10:47:25Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/De3RK1gLFAc",
    "published": "2025-03-12T10:47:25Z",
    "summary": "<h4>h4</h4>",
    "content": "See summary"
  }
}

Example 16

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/8cpm2VQ2NZw",
  "published": "2025-03-12T10:47:36Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/JpVxl0wHHCk",
    "published": "2025-03-12T10:47:36Z",
    "summary": "<h5>h5</h5>",
    "content": "See summary"
  }
}

Example 17

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/anpqbZ0_30s",
  "published": "2025-03-12T10:47:47Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/7F74e-MmMX4",
    "published": "2025-03-12T10:47:47Z",
    "summary": "<h1>h1</h1><h2>h2</h2>",
    "content": "See summary"
  }
}

Example 18

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/PS5I7MMhgng",
  "published": "2025-03-12T10:47:58Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/J2l4l77Z6Bc",
    "published": "2025-03-12T10:47:58Z",
    "summary": "<code>code</code>",
    "content": "See summary"
  }
}

Example 19

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/Hl-2weGQFKQ",
  "published": "2025-03-12T10:48:08Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/UhyiM1IugGA",
    "published": "2025-03-12T10:48:08Z",
    "summary": "<pre>pre</pre>",
    "content": "See summary"
  }
}

Example 20

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/goxhP_lsv_s",
  "published": "2025-03-12T10:48:19Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/t-lrziXbXHo",
    "published": "2025-03-12T10:48:19Z",
    "summary": "<blockquote>blockquote</blockquote>",
    "content": "See summary"
  }
}

Example 21

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/meSkg5hjbxs",
  "published": "2025-03-12T10:48:30Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/EtgDCHxnN7E",
    "published": "2025-03-12T10:48:30Z",
    "summary": "line<br/>break",
    "content": "See summary"
  }
}

Example 22

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/SeLO6P-6VgQ",
  "published": "2025-03-12T10:48:41Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/4mNqxR51iqA",
    "published": "2025-03-12T10:48:41Z",
    "summary": "<p>paragraph</p>",
    "content": "See summary"
  }
}

Example 23

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/gsqScvs0TH4",
  "published": "2025-03-12T10:48:51Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/7TWPYQUBRVg",
    "published": "2025-03-12T10:48:51Z",
    "summary": "<small>small</small>",
    "content": "See summary"
  }
}

Example 24

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/PrD-uhnzdAU",
  "published": "2025-03-12T10:49:02Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/Svd_AZ74FUk",
    "published": "2025-03-12T10:49:02Z",
    "summary": "<sup>sup</sup>",
    "content": "See summary"
  }
}

Example 25

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/YlLFdq5l_zw",
  "published": "2025-03-12T10:49:13Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/AhB8ssuR9YM",
    "published": "2025-03-12T10:49:13Z",
    "summary": "<sub>sub</sub>",
    "content": "See summary"
  }
}

Example 26

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/uAfd-BGM-DI",
  "published": "2025-03-12T10:49:24Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/9nKwbwcz0ZQ",
    "published": "2025-03-12T10:49:24Z",
    "summary": "<a href='https://funfedi.dev'>funfedi</a>",
    "content": "See summary"
  }
}

Example 27

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/ckAmShQmEbw",
  "published": "2025-03-12T10:49:34Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/2hvLia-xh_U",
    "published": "2025-03-12T10:49:34Z",
    "summary": "<script>alert('hi');</script>",
    "content": "See summary"
  }
}

Example 28

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/xaceVfRZjcI",
  "published": "2025-03-12T10:49:45Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/LI5kjlHTVAY",
    "published": "2025-03-12T10:49:45Z",
    "summary": "<img src=\"http://pasture-one-actor/assets/nlnet.png\" alt=\"NLNET Logo\" />",
    "content": "See summary"
  }
}

Example 29

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/epiNtna9zyI",
  "published": "2025-03-12T10:49:56Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/vvVQADMhfWE",
    "published": "2025-03-12T10:49:56Z",
    "summary": "wbr: Fernstra\u00dfen<wbr />bau<wbr />privat<wbr />finanzierungs<wbr />gesetz",
    "content": "See summary"
  }
}

Example 30

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a59bykudnkgb0003"
  ],
  "id": "http://pasture-one-actor/actor/PBIgijYeuZw",
  "published": "2025-03-12T10:50:07Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a59bykudnkgb0003"
    ],
    "id": "http://pasture-one-actor/actor/t7o6JeyqiBo",
    "published": "2025-03-12T10:50:07Z",
    "summary": "Audio <audio controls src=\"http://pasture-one-actor/assets/cow_moo.mp3\"></audio>",
    "content": "See summary"
  }
}