I want to validate whether an element exists after the UI rendering of the page.
Similar to how we use SELENIUM to find elements, I know they are different tools.
But I want to know if there is any way to verify the elements post the UI rendering.
UI testing is a wide other subject that server performance testing.
You already mentioned the most popular UI testing framework.
Either your new element exists in a JSON (or other document) you can fetch from your server or you can check the html with Gatling checks if it’s rendered server side.
But Gatling does not execute javascript nor render anything.