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The method to determine if an element becomes visible when scrolling is to use JavaScript and the Document Object Model (DOM) to detect the position of the element in relation to the viewport.

1. Get the element's position: Use the getBoundingClientRect() method to get the element's position relative to the top and left of the viewport.

2. Get the viewport height: Use the window.innerHeight property to get the height of the viewport.

3. Calculate the distance between the element and the top of the viewport: Subtract the element's top position from the viewport height to get the distance between the element and the top of the viewport.

4. Check if the element is visible: If the distance between the element and the top of the viewport is less than or equal to the viewport height, the element is visible.

5. Add a scroll event listener: To continuously check if the element becomes visible when scrolling, add a scroll event listener to the window object.

6. Implement desired behavior: Once the element becomes visible, add the desired behavior, such as animating the element or triggering an event.