Basic HTML tags¶

A main focus of the Fediverse is microblogging, using objects of type Note to represent posts. This support table shows a set of tags, that we consider reasonable to support for such a purpose.

The ✅ means that the html tag was left unchanged. ❓ indicates the content was changed, by hovering over it, one can see into what.

❓ for misskey is due us not supporting checking markdown yet.

Support Table Preview¶

content	Object	Activity
<b>bold</b>	Object	Activity
<strong>strong</strong>	Object	Activity
<i>italic</i>	Object	Activity
<em>emphasis</em>	Object	Activity
<s>stricken</s>	Object	Activity
<ol><li>ordered</li></ol>	Object	Activity
<ul><li>unordered</li></ul>	Object	Activity
<code>code</code>	Object	Activity
<pre>pre</pre>	Object	Activity
<blockquote>blockquote</blockquote>	Object	Activity
line<br>break	Object	Activity
<p>paragraph</p>	Object	Activity
link with class hashtag	Object	Activity
link with class mention	Object	Activity

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/object/FouhdZof7nM",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/object/qUI3Qyq_jkY",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/object/0V4eP9shM48",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 4¶

{
  "@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/object/EqyX-RmiD9g",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 5¶

{
  "@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/object/GOBpaWBylE8",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 6¶

{
  "@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/object/QIVoSkAwuoM",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 7¶

{
  "@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/object/7r0MJdTszNM",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 8¶

{
  "@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/object/opFdiA7rchY",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 9¶

{
  "@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/object/kDPrBH12-N8",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 10¶

{
  "@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/object/qlFlcf6b1bE",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 11¶

{
  "@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/object/OizIGGvn6us",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 12¶

{
  "@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/object/RSFng-vTxmc",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 13¶

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "link with class hashtag\n        \n<a href=\"https://tags.test/test\" class=\"hashtag\">#test</a>",
  "id": "http://actor.example/object/oVWdf2mpw0c",
  "published": "2025-10-04T11:50:25Z",
  "tag": [
    {
      "name": "#test",
      "type": "Hashtag"
    }
  ],
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 14¶

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "link with class mention\n\n<a href=\"http://pasture-one-actor/actor\" class=\"mention\">@actor@pastue-one-actor</a>",
  "id": "http://actor.example/object/PKZqHUK1wIw",
  "published": "2025-10-04T11:50:25Z",
  "tag": [
    {
      "href": "http://pasture-one-actor/actor",
      "name": "@actor@pasture-one-server",
      "type": "Mention"
    }
  ],
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/wR2PNJwUBpE",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<b>bold</b>",
    "id": "http://actor.example/object/D4bDq9Zf1MY",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/NvRyLDNr2nQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<strong>strong</strong>",
    "id": "http://actor.example/object/7JEJQpxetJE",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/RP9DouUvm7o",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<i>italic</i>",
    "id": "http://actor.example/object/5fh_jURUb3I",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/5TAdYh8bexw",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<em>emphasis</em>",
    "id": "http://actor.example/object/qLeGfPefkJI",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/q2lTAvTqtzI",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<s>stricken</s>",
    "id": "http://actor.example/object/L1goiq2n6-Q",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/dMt_aSDIloI",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<ol><li>ordered</li></ol>",
    "id": "http://actor.example/object/NWoSsYtRksw",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/dxdltpyATDo",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<ul><li>unordered</li></ul>",
    "id": "http://actor.example/object/4-qBBIUtsFo",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/JqdqZfD3wug",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<code>code</code>",
    "id": "http://actor.example/object/kWjsVSGwWqM",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#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/activity/4yPfAaep2Es",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<pre>pre</pre>",
    "id": "http://actor.example/object/-zAnq5KEpd4",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 10¶

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/6BnrQgGggpQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<blockquote>blockquote</blockquote>",
    "id": "http://actor.example/object/iWVipOsnJIo",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 11¶

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/JoZIBDaX6OA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "line<br>break",
    "id": "http://actor.example/object/dAwpd9a8okg",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 12¶

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/cTFNoOap3X0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "<p>paragraph</p>",
    "id": "http://actor.example/object/hxoBqq5jp8U",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 13¶

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/UFSJE8EV3qQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "link with class hashtag\n        \n<a href=\"https://tags.test/test\" class=\"hashtag\">#test</a>",
    "id": "http://actor.example/object/5ZbwNb2r_5g",
    "published": "2025-10-04T11:50:25Z",
    "tag": [
      {
        "name": "#test",
        "type": "Hashtag"
      }
    ],
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 14¶

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/tDwQYUCB9-Q",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "link with class mention\n\n<a href=\"http://pasture-one-actor/actor\" class=\"mention\">@actor@pastue-one-actor</a>",
    "id": "http://actor.example/object/kvBqW_86bdo",
    "published": "2025-10-04T11:50:25Z",
    "tag": [
      {
        "href": "http://pasture-one-actor/actor",
        "name": "@actor@pasture-one-server",
        "type": "Mention"
      }
    ],
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "type": "Create"
}