Which HTML tags are supported in publications?

In the text of posts, captions, and media descriptions, a limited set of HTML tags is supported for basic formatting.

Please note:

The h1 and h2 tags are used for headings. In most social networks, their rendering may differ or be converted to bold text.
The strike and s tags are equivalent — both create strikethrough text.
The tg-spoiler tag hides text behind a spoiler in Telegram and is revealed when the user taps it.
The code and pre tags are intended for code. code is for short inline fragments, pre is for multi‑line blocks that preserve spaces and line breaks.
All other HTML tags not listed above are automatically removed for security and compatibility reasons.

Examples

Clickable link:

<a href="https://postmypost.io">Go to website</a>

Text emphasis:

<b>Important text</b>, <i>italic</i>, <u>underlined</u>, <s>strikethrough</s>

Headings and quote:

<h1>Heading H1</h1>
<h2>Heading H2</h2>
<blockquote>A quote or highlighted paragraph</blockquote>

Lists:

<ul>
  <li>Unordered list item</li>
  <li>Another item</li>
</ul>

<ol>
  <li>First item</li>
  <li>Second item</li>
</ol>

Code:

Inline fragment: <code>npm run build</code>

Multi‑line code block:

<pre>
function hello() {
  console.log('Hello, world!');
}
</pre>

Spoiler (Telegram):

<tg-spoiler>Secret text that will be revealed on tap</tg-spoiler>

Tips

Check preview before publishing: different social networks may render HTML formatting differently.
Avoid nesting unsupported tags inside supported ones — such HTML will be sanitized.