htmx_examples/templates/partials/inline_validation_error.html

<div hx-target="this" hx-swap="outerHTML" class="error">
    <label>Email Address</label>
    <input name="email" hx-post="/contact/email" hx-indicator="#ind" value="{{ email }}">
    <img id="ind" src="/img/bars.svg" class="htmx-indicator"/>
    <div class='error-message'>{{ error_message }}</div>
  </div>