The issue you are experiencing with scroll to bottom detection on zoom out in Google Chrome is likely related to how the browser handles scroll events and the change in viewport size due to zooming.

When you zoom out in Google Chrome, the content appears smaller, and more content becomes visible within the viewport. This can affect how the browser calculates the scroll position and when it triggers the scroll events.

To better understand and address the issue, consider the following factors:

  1. Scroll Event Timing: When you zoom out, more content becomes visible within the viewport. This means that the scroll events might be triggered at different times compared to when the page is not zoomed out. The timing of scroll events can impact scroll-to-bottom detection logic.

  2. Pixel-Based Scroll Position: Scroll events typically provide the current scroll position in pixels. When you zoom out, the effective size of a pixel changes, affecting how the scroll position is calculated. As a result, scroll-to-bottom detection based on a fixed pixel threshold may not work as expected when zoomed out.

  3. Percentage-Based Scroll Position: Instead of relying on a fixed pixel threshold, consider using a percentage-based approach to detect scroll to the bottom. Calculate the percentage of the scroll position relative to the total scrollable height, and trigger the "scroll to bottom" action when the percentage reaches a specific threshold.

  4. Debouncing or Throttling Scroll Events: To avoid excessive event triggering during scrolling (especially when zoomed out), consider using techniques like debouncing or throttling to limit the frequency of scroll event handling. These techniques can improve performance and prevent unnecessary action triggers.

  5. Test Across Different Zoom Levels: Test your scroll-to-bottom detection logic across different zoom levels to ensure it works as expected in various scenarios.

Here's an example of using a percentage-based approach to detect scroll to the bottom in JavaScript:

javascript
// Assuming you have a scrollable element with id "scrollableElement" const scrollableElement = document.getElementById('scrollableElement'); scrollableElement.addEventListener('scroll', function() { const scrollTop = scrollableElement.scrollTop; const scrollHeight = scrollableElement.scrollHeight; const clientHeight = scrollableElement.clientHeight; const scrollPercentage = (scrollTop / (scrollHeight - clientHeight)) * 100; // Adjust the threshold percentage as needed const scrollThresholdPercentage = 80; if (scrollPercentage >= scrollThresholdPercentage) { // Scroll has reached the bottom, trigger the action console.log('Scroll to bottom detected'); } });

By using a percentage-based approach, you can make the scroll-to-bottom detection more robust and responsive to changes in the viewport due to zooming in Google Chrome.

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