How to Maintain Consistent Text Rendering During CSS Transitions in Webkit?

Maintaining Text Consistency during CSS Transitions in Webkit

One common issue encountered when utilizing CSS transitions to animate elements is the potential alteration of text rendering in Webkit browsers. During transitions, text adjacent to the transformed element may experience subtle changes in appearance. This phenomenon is particularly noticeable for non-transformed text elements.

Cause of the Issue

The root cause of this issue lies in Webkit's font-smoothing algorithm. When the transformed element undergoes a transition, the browser adjusts its rendering to compensate for potential blur or distortion introduced by the transformation. However, this adjustment can inadvertently affect non-transformed text elements.

Solution

To prevent this text rendering issue, one can employ a technique called hardware acceleration on the parent element of the transformed element. This can be achieved by adding the following CSS rule:

<code class="css">-webkit-transform: translateZ(0px);</code>

Hardware acceleration offloads the rendering workload from the CPU to the GPU, improving performance and reducing the likelihood of rendering artifacts. By applying hardware acceleration to the parent element, we effectively force the entire area to be rendered by the GPU, ensuring consistent text rendering throughout the transition.

Caveat

It's important to note that this hack comes with a potential trade-off. Hardware acceleration can disable font-smoothing, leading to a degradation in text rendering quality. The severity of this issue depends on the specific fonts, browser, and operating system being used.

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