Have you ever wondered how screen readers interact with browsers to provide accessible experiences? You may have heard terms like "accessibility APIs", “accessibility tree” or "accessible name computation". But what do they refer to, really? In this talk, we will demystify the process in which browsers generate and update the accessibility tree. We will look into its key elements, and how HTML elements and ARIA attributes map into it. Lastly, we will explore how web developers can leverage it for effective debugging. Let's dive into the inner workings of screen readers-browsers interactions!