The hx-preserve attribute allows you to keep a section of content unchanged between HTML replacement. When hx-preserve is set to true, an element is preserved (by id) even if the surrounding HTML is updated by htmx. An element must have an id to be preserved properly.

Here is an example of a youtube embed, which would be unaffected an htmx request:

  <iframe hx-preserve='true' id='iframe1' width="1268" height="720" src="https://www.youtube.com/embed/Z1oB2EDu5XA" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>