Why Does Text Become Blurry When Using translate3d and Scale in WebKit Browsers?

Dealing with Blurry Text in WebKit Browsers: CSS Scaling and translate3d

WebKit-based browsers, including Chrome and Safari, often exhibit a peculiar issue where CSS-scaled elements become significantly blurry when coupled with translate3d transformations. Developers commonly encounter this challenge when attempting to apply transformations while maintaining proper scaling.

To illustrate the problem, consider the following code snippet:

.test {
  -webkit-transform: translate3d(0px, 100px, 0px);
}

.testInner {
  -webkit-transform: scale(1.2);
  text-align: center;
}

In this example, the "testInner" element is translated along the Y-axis and scaled by a factor of 1.2. When viewed in a WebKit browser, the text within the "testInner" element appears visibly blurry.

Understanding the Issue

WebKit browsers handle 3D transformed elements as textures, leveraging hardware acceleration for improved performance. However, this treatment leads to a drawback in text clarity.

Potential Workarounds

Unfortunately, there is no straightforward workaround for this issue. To mitigate the blurriness, consider adopting one of the following approaches:

• Increase Text Size and Downscale Element: This technique involves enlarging the text and scaling down the element to produce a higher-resolution texture. This compensates for the inherent blurriness introduced by WebKit's rendering.

Example:

.testInner {
  -webkit-transform: translate3d(0px, 100px, 0px) scale(1, 0.8);
  text-align: center;
}

• Adding Text Shadow: While the previous method addresses the blurriness, it may result in reduced antialiasing quality. To mitigate this, consider adding a text shadow:

Example:

.testInner {
  -webkit-transform: translate3d(0px, 100px, 0px);
  text-align: center;
  text-shadow: 1px 1px 1px #000;
}

Conclusion

WebKit's handling of 3D transformed text remains a challenge for developers seeking clarity and scalability. While the presented workaround methods provide partial solutions, it is crucial to consider them in light of the desired end result.

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