Why is My CSS Animation Flickering on iPhones and How Can I Fix It?

Understanding the iPhone WebKit CSS Animation Flickering Issue

iPhone users may encounter flickering issues when viewing websites that utilize CSS animations, particularly when using WebKit browsers. This can be observed in the example website provided, where gun objects flicker upon scrolling.

Examining the Underlying WebKit Properties:

The developer has utilized three WebKit-specific CSS properties:

• '-webkit-transition': Controls animation transitions
• '-webkit-transform': Manipulates object positions
• '-webkit-backface-visibility': Hides the "back" face of an element

Addressing the Flickering:

The flickering can be attributed to two primary factors:

• Hidden Back Faces: The '-webkit-backface-visibility' property initially hindered the animation by hiding the "back" faces of objects. This resulted in a sudden reveal of objects, causing the perceived flicker.
• Perspective Rendering: The addition of '-webkit-perspective' with a value of 1000 alleviated this issue. This property simulates a three-dimensional rendering effect, which effectively reduced the visibility of the flashing objects.

Resolving the White Background Issue:

Additionally, the user noticed a white background appearing when clicking specific buttons. This is likely due to the animation of an overlay element or background layer. To address this, the developer should refine the animation timing or visibility of the offending element.

Conclusion:

By adding both '-webkit-backface-visibility' and '-webkit-perspective' properties to the CSS, the flickering and background issues were effectively resolved. This solution demonstrates the importance of understanding the nuances of WebKit rendering when creating websites for iOS devices.

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