How to Build an SVG Icon System — Symbol Sprites & Use Guide
A proper SVG icon system uses <symbol> definitions and <use> references — one file, one HTTP request, infinite reuse with full CSS control.
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Building the SVG Sprite File
Collect all icon SVGs, wrap each in a `<symbol id='icon-name' viewBox='0 0 24 24'>`, and combine into a single `sprite.svg` in `<defs>`. Place this SVG hidden at the top of your HTML body (display:none) or serve as an external file.
- <symbol id='icon-home' viewBox='0 0 24 24'>...</symbol>
- Reference: <svg><use href='sprite.svg#icon-home'/></svg>
- Set width/height on the outer <svg> to control icon size
Icon Color Theming with currentColor
Use `fill='currentColor'` on paths inside each `<symbol>`. The icon then inherits the parent element's CSS `color` property — change the color of the icon by setting `color` on the parent element, no SVG modifications needed.
- Set fill='currentColor' on symbol paths
- Icon inherits: .btn { color: blue; } → icon turns blue
- Works with CSS custom properties for dynamic theming
Frequently Asked Questions
How do I use an SVG icon sprite in React?
Import the sprite SVG and use it with an <svg><use href={`${sprite}#icon-name`}/></svg> pattern. Or use a component library like @radix-ui/react-icons or react-svg-sprite for structured icon management.
Should I use an SVG sprite or individual SVG files for icons?
Sprite for repeated icons across many pages (one HTTP request). Individual files for rarely used icons or when tree-shaking matters in JS bundlers. React with bundler inlining often favors individual SVG components.
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