Write SVG lets you write SVGs directly in CSS.

/* before */
@svg square {
	@rect {
		fill: var(--color, black);
		width: var(--size);
		height: var(--size);
	}
}
.example {
	background: svg(square param(--color green) param(--size 100%)) center / cover;
}
/* after */
.example {
	background: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Crect fill='green' width='100%25' height='100%25'/%3E%3C/svg%3E") center / cover;
}

@svg at-rules generate SVG elements available to CSS. Within an @svg, descendant at-rules (like @rect) are interpreted as elements, while declarations (like width) are interpreted as attributes.

The svg() function renders an @svg as a data url(). var() functions within an @svg honor the variables passed in through param() functions.

Options

`utf8`

Type: Boolean
Default: true

Allows you to define whether UTF-8 or base64 encoding will be used.

/* before { utf8: false } */
@svg square {
	@rect {
		fill: black;
		width: 100%;
		height: 100%;
	}
}
.example {
	background: svg(square);
}
/* after */
.example {
	background: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjxyZWN0IGZpbGw9ImJsYWNrIiB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIi8+PC9zdmc+");
}

Usage

Add Write SVG to your build tool:

npm install jonathantneal/postcss-write-svg --save-dev

Node

require('postcss-write-svg').process(YOUR_CSS, { /* options */ });

PostCSS

Add PostCSS to your build tool:

npm install postcss --save-dev

Load Write SVG as a PostCSS plugin:

postcss([
	require('postcss-write-svg')({ /* options */ })
]).process(YOUR_CSS, /* options */);

Gulp

Add Gulp PostCSS to your build tool:

npm install gulp-postcss --save-dev

Enable Write SVG within your Gulpfile:

var postcss = require('gulp-postcss');
gulp.task('css', function () {
	return gulp.src('./src/*.css').pipe(
		postcss([
			require('postcss-write-svg')({ /* options */ })
		])
	).pipe(
		gulp.dest('.')
	);
});

Grunt

Add Grunt PostCSS to your build tool:

npm install grunt-postcss --save-dev

Enable Write SVG within your Gruntfile:

grunt.loadNpmTasks('grunt-postcss');
grunt.initConfig({
	postcss: {
		options: {
			use: [
				require('postcss-write-svg')({ /* options */ })
			]
		},
		dist: {
			src: '*.css'
		}
	}
});