https://avivaromm.com/wp-content/plugins/ultimate-blocks-pro/src/block-extensions/expand/front.js?ver=3.6.1

1document.addEventListener("DOMContentLoaded", () => {
2  // Get all expand toggle buttons that were already initialized by the free version
3  document.querySelectorAll(".ub-expand-toggle-button").forEach((instance) => {
4    const addProFeatures = () => {
5      const blockRoot = instance.closest(".ub-expand");
6
7      const fadeElement = blockRoot?.querySelector(".ub-expand-partial > div");
8      if (fadeElement) {
9        fadeElement.classList.toggle("ub-fade");
10      }
11    };
12
13    // Enhance click handler
14    const originalClickHandler = instance.onclick;
15    instance.addEventListener("click", (e) => {
16      if (originalClickHandler) {
17        originalClickHandler.call(instance, e);
18      }
19      addProFeatures();
20    });
21
22    // Enhance keydown handler
23    instance.addEventListener("keydown", (e) => {
24      if ([" ", "Enter"].includes(e.key)) {
25        addProFeatures();
26      }
27    });
28  });
29});