CSS scale blur
CSS Scale Blur
In web development, we often use CSS to design and layout pages. The transform attribute is a commonly used CSS property used to modify an element’s rotation, scaling, and translation. When using the transform attribute for scaling, blurring can sometimes occur, particularly in Chrome. This article will explain scaling blur in CSS in detail and provide solutions.
Why does blurring occur?
In CSS, transform: scale() is used to scale an element. When scaling an element, the browser interpolates the values to smoothly transition to the target size. However, Chrome may experience a certain degree of blurring when scaling. This is because Chrome applies anti-aliasing to the element during scaling, which can cause blurring of edges.
How to solve the blur effect?
Method 1: Using transform: scale()‘s 3d mode
To avoid zoom blur in Chrome, try using transform: scale3d() for zooming. The scale3d function scales in three dimensions independently, bypassing Chrome’s anti-aliasing.
/* Zooming with scale3d */
.element {
transform: scale3d(1.1, 1.1, 1);
}
Method 2: Using Other Units with transform: scale()
Another way to solve the zoom blur issue is to try using other units for zooming. Typically, we use units like percentages (%) and decimals (1.1) for scaling. However, in some cases, using units like pixels (px) or viewport widths (vw) for scaling may reduce the blurring effect.
/* Scale using px units */
.element {
transform: scale(1.1);
}
/* Scale using vw units */
.element {
transform: scale(4vw);
}
Method 3: Add transform-style: preserve-3d
In some cases, adding the transform-style: preserve-3d property can reduce the blurring effect. This property tells the browser to preserve the element’s 3D nature when performing 3D transformations, without performing optimizations, thus reducing the blurring effect.
/* Add the transform-style property */
.element {
transform: scale(1.1);
transform-style: preserve-3d;
}
Sample Code and Effect Demonstration
Next, we’ll use sample code to demonstrate the scaling blur issue and the solution.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Example of CSS scaling blur problem</title>
<style>
.element {
width: 200px;
height: 100px;
background-color: #37a;
transform: scale(1.5);
margin-bottom: 20px;
}
.element.scale3d {
transform: scale3d(1.5, 1.5, 1);
}
.element.pixel {
transform: scale(300px, 150px);
}
.element.vw {
transform: scale(40vw, 20vw);
}
.element.preserve-3d {
transform: scale(1.5);
transform-style: preserve-3d;
} </style>
</head>
<body>
<div class="element">Scale effect - normal</div>
<div class="element scale3d">Scale effect - scale3d</div>
<div class="element pixel">Scale effect - px unit</div>
<div class="element vw">Scale effect - vw unit</div>
<div class="element preserve-3d">Scale effect - preserve-3d</div>
</body>
</html>
In the above example code, we create an element with a scale effect and use the scale3d(), px, vw, and preserve-3d methods to perform scaling operations. By running the above example code, you can clearly see how different methods affect the scaling blur issue.
Conclusion
Scaling blur is a common problem in CSS, especially in Chrome. This article explains the causes of scaling blur and how to address it by adding transform: scale3d() , changing units, or adding transform-style: preserve-3d .