Why Doesn't Firefox and Internet Explorer Animate Background Images?

Animation Background Images in Firefox and Internet Explorer

In CSS, animating background images may not function consistently across browsers. Firefox and Internet Explorer are known to exclude keyframe animations involving background-image properties.

Understanding the Specification

According to CSS specs, background-image is not an explicitly animatable property. However, there is no clear guidance on how browsers should handle it within animations. This has led to varying approaches from different browsers.

Chrome's Handling

Chrome displays background images in keyframes animations. This is in contrast to Firefox and Internet Explorer, which exhibit no change in background images during animation.

Firefox's Inconsistency

Firefox differentiates between transitions and animations when dealing with background-image. In transitions, it immediately displays the updated image. However, in animations, the new background image fails to appear.

The Solution

To ensure cross-browser compatibility, it is recommended to avoid using background-image directly in keyframes. Instead, consider using alternative approaches such as adjusting background-position or opacity.

Conclusion

While background-image animations may work in some browsers like Chrome, it is unreliable for consistent behavior across major browsers. For seamless animations, employ alternative methods that do not rely on animating background-image properties.

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