--- url: /integration/html.md description: >- Integrate Add to Calendar PRO with HTML and JavaScript. Simple CDN-based integration for calendar buttons and RSVP forms. --- # How to integrate Buttons and RSVP Forms with simple HTML/JavaScript ## Step 1: CDN script integration Load the script via the jsDelivr CDN. You can place the respective script tag anywhere on your page. We recommend the `` area. It loads async and also gets put to the end of the loading process automatically. ```html ``` ## Step 2: Use it Start using it by adding a `` tag to your source code. ## Bring your own button Alternatively, you can also trigger the button or form programmatically via the atcb\_action function. You would need to write more custom JavaScript for this case. Also mind that this will force a modal to appear. You should provide an HTML element as second parameter. Event it is optional, it optimizes the UX; especially for keyboard navigation. In the following example, we also use this element as trigger onClick: ```html ```