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

Animating Background Images: Cross-Browser Compatibility

In web animations, it's common to change the background image during transitions or keyframes. However, users have reported that background-image animations don't work in Firefox or Internet Explorer.

Why Firefox and Internet Explorer Fail to Display Background-Image Animations

As specified in CSS standards, background-image is not considered an animatable property. Firefox and Internet Explorer adhere to this specification, resulting in the missing animations.

Chrome's Behavior

Despite the specification, Chrome displays the background-image animations. This is due to Chrome's interpretation that background-image is implicitly animatable (within opacity and position).

Firefox's Strange Handling of Transitions

Firefox behaves inconsistently between transitions and animations. While it displays the background-image when transitioning, it skips the animation entirely.

Solution: Using Alternative Properties

To ensure cross-browser compatibility, avoid using background-image within keyframes. Instead, use background-position or opacity, as suggested by the following quote:

"To animate gradients they must be the same type."

Code Snippet:

In the provided code snippet, the first div shows a background image transition (working in all browsers), while the second div tries to animate the background image (not working in Firefox or Internet Explorer).

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