Is anyone familiar with the issue where the subnavigation on a Webflow website is being positioned absolute over the whole page and moving when scrolling on certain combinations of browsers and operating systems? Is there a workaround to fix this?

You're describing a common layout issue where a subnavigation menu (dropdown or flyout) is positioned absolutely and doesn't behave consistently across all browser/OS combinations, sometimes floating over the page or scrolling with it.

1. Understand the Root Cause

• This typically occurs when a dropdown or flyout menu is styled with position: absolute and is nested inside an element that has overflow: hidden, position: relative, or lacks proper stacking context.
• Inconsistent rendering between Safari, Firefox, and Chrome (especially on macOS and mobile Safari) may exacerbate the issue due to different default handling of positioning and overflow.

2. Check the Parent Container’s Positioning

• Make sure the parent of the subnavigation is not set to position: relative unless intentionally creating a scoped positioning context.
• Try placing the subnavigation at the root level of the body and using position: fixed or absolute with top/left positioning based on viewport instead.

3. Avoid Scroll-Based Positioning Issues

• Avoid using position: absolute on elements that need to stay in place during scrolling if they're nested within a scrollable container.
• For mega menus or sticky navigation, consider using position: fixed to lock them to the viewport.

4. Use Webflow’s Native Dropdown Component Correctly

• If using Webflow’s Dropdown element, ensure it's:
• Placed outside of elements with constrained overflow (like overflow: hidden).
• Not duplicated via interactions or symbols in a way that breaks override visibility settings.

5. Apply a Z-Index Layer Fix

• Manually add or adjust a higher z-index value on the dropdown to ensure proper stacking over other content.
• Be consistent across breakpoints and watch for overlapping style conflicts.

6. Use Custom Code as a Last Resort

• If browser inconsistencies persist, apply a conditional CSS fix using media queries or browser-detection techniques to tweak positioning for certain environments.
• Example tweak: set position: fixed with top/left values on macOS Safari only using targeted class/app detection (avoid global overrides).

7. Test Across Browsers and Devices

• Use cross-browser testing tools like BrowserStack, or actual devices to confirm behavior on:
• macOS Safari
• Windows Chrome/Firefox
• iOS Safari

Summary

The subnavigation issue arises from improper use of position: absolute inside elements with layout restrictions or inconsistent stacking contexts. To fix it, remove conflicting parent styles, use fixed positioning if needed, test dropdown behavior thoroughly, and adjust z-index and layout structure to ensure consistency across browsers.