Why is the background image on my Webflow site not staying fixed while scrolling in preview mode on Windows 11 and MacBook, despite it being set as a fixed image and there being no code changes or size restrictions?

A background image set to "Fixed" in Webflow may not appear fixed while scrolling in preview mode if the CSS property isn't fully supported or behaves differently in various browsers or operating systems.

1. Confirm Fixed Background Setting

• Select the element (e.g., Section or Div Block) with the background image.
• In the Style panel, ensure:
• Background Attachment is set to Fixed.
• Other properties like Position and Size don’t override the attachment behavior.

2. Understand Browser Support Limitations

• The CSS background-attachment: fixed property behaves inconsistently across platforms due to GPU acceleration and compositor limitations.
• On macOS (Safari) and some Windows 11 systems using hardware acceleration, a fixed background may not display correctly.
• Safari on macOS is especially known for inconsistent rendering or completely ignoring fixed background images on mobile and certain desktop contexts.

3. Test in Different Browsers

• Preview mode in Webflow does not exactly replicate real browser rendering.
• Publish the site and open it in:
• Google Chrome
• Mozilla Firefox
• Microsoft Edge
• Assess whether the fixed background works in the live environment.

4. Avoid Webflow Preview Mode for Critical Visual Testing

• The built-in Preview (eye icon) mode is limited by the Webflow Designer’s rendering constraints.
• Always use the published URL to verify fixed background behaviors, as browser compositing differs from Webflow’s canvas rendering.

5. Try Alternative Techniques If Needed

If you need consistent "fixed" behavior and it’s not rendering as expected:

• Use a full-screen background image in a div layer with position: fixed, and place it behind the content with z-index and opacity controls.
• Ensure it’s not being overridden by animations, transforms, or parent containers with perspective or 3D settings (any of which can disable background-attachment: fixed support).

6. Verify Device-Specific Behavior

• MacBooks with Retina displays or modern GPUs may suppress fixed backgrounds due to performance optimizations.
• Windows laptops may behave differently depending on GPU drivers and display scaling settings.

Summary

The fixed background image not appearing correctly while scrolling is likely due to inconsistent browser or OS-level support for background-attachment: fixed, especially in Safari or certain GPU contexts. Always test on the live site and consider using fixed-position divs as an alternative for consistent cross-platform behavior.