>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3468841. --> Reported by: [sea2709](https://www.drupal.org/user/3589873) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>I'm using ECA module to create a custom ECA block. While building the block, I need to apply some stylings, and I'm using Tailwind for theme development. Tailwind allows us to use classes with square brackets, for example <a href="https://tailwindcss.com/docs/hover-focus-and-other-states#arbitrary-groups">https://tailwindcss.com/docs/hover-focus-and-other-states#arbitrary-groups</a> </p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <ol> <li>Create a custom ECA block by using ECA block event.</li> <li>Add action Renderer: Add Class, and configure this action to use a class name with square brackets (for example: [&amp;_.cf-form-label]:tw-hidden - this class is to set hidden for all children having the class .cf-form-label).</li> <li>Everything in the square brackets is removed since ECA captured it as a token, and this token does not exist, so an empty string is returned</li> </ol> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>With all fields supporting tokens, it would be great if there is an option to enable token support or not.</p>