CSS Tutorials

Performance Optimization : Minification, Concatenation, and CSS Sprites

Minification is the process of shrinking a file by removing extraneous whitespace and comments.

Concatenation: a technique to minimize HTTP requests that combines several CSS files into one.

Using CSS sprites, you can minimize the amount of HTTP requests by combining several pictures into one.

Bash Code

# Example command to minify and concatenate CSS with npm package 'cssnano' and 'concat-cli'
npm install cssnano-cli concat-cli
cssnano styles.css styles.min.css
concat -o all-styles.min.css reset.css main.css styles.min.css

CSS Sprites Example

<style>
.sprite {
    background: url('spritesheet.png') no-repeat;
}
.sprite--icon1 {
    width: 32px;
    height: 32px;
    background-position: 0 0;
}
.sprite--icon2 {
    width: 32px;
    height: 32px;
    background-position: -32px 0;
}
</style>

<div class="sprite sprite--icon1"></div>
<div class="sprite sprite--icon2"></div>

Concatenation and minification: For improved efficiency, combine many CSS files into a single minimal file by using the shell instructions.

CSS Sprites: The code sample shows how to use an icon sprite sheet. Although they reference distinct portions of the same image file by specifying separate background-position values, the sprite--icon1 and sprite--icon2 classes used the same image file.

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Performance Optimization : Minification, Concatenation, and CSS Sprites

Beginner 5 Hours

Minification is the process of shrinking a file by removing extraneous whitespace and comments.

Concatenation: a technique to minimize HTTP requests that combines several CSS files into one.

Using CSS sprites, you can minimize the amount of HTTP requests by combining several pictures into one.

Bash Code

# Example command to minify and concatenate CSS with npm package 'cssnano' and 'concat-cli'
npm install cssnano-cli concat-cli
cssnano styles.css styles.min.css
concat -o all-styles.min.css reset.css main.css styles.min.css

CSS Sprites Example

<style>
.sprite {
    background: url('spritesheet.png') no-repeat;
}
.sprite--icon1 {
    width: 32px;
    height: 32px;
    background-position: 0 0;
}
.sprite--icon2 {
    width: 32px;
    height: 32px;
    background-position: -32px 0;
}
</style>

<div class="sprite sprite--icon1"></div>
<div class="sprite sprite--icon2"></div>

Concatenation and minification: For improved efficiency, combine many CSS files into a single minimal file by using the shell instructions.

CSS Sprites: The code sample shows how to use an icon sprite sheet. Although they reference distinct portions of the same image file by specifying separate background-position values, the sprite--icon1 and sprite--icon2 classes used the same image file.

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