PostCSS plugin to add support for range(), allowing for a responsive range value between two screen sizes.

yarn add postcss-range-value --dev

Require postcssRange at the top of Webpack or Mix:

const postcssRange = require('postcss-range-value');

postcss([postcssRange]);

mix
    .sass('resources/assets/styles/editor.scss', 'styles')
    .options({
        postCss: [postcssRange]
    });

Some config can be passed into postcssRange() in Webpack or Mix.

Example below with the current defaults.

postcssRange({
    rootRem: 16,
    prefix: 'range',
    screenMin: '48rem', // 768
    screenMax: '100rem', // 1600
    clamp: true,
})

Range values can be passed to any CSS property that supports sizing.

range($min-value, $max-value, $screen-min, $screen-max)

The range value will responsively scale from $min-value to $max-value between $screen-min and $screen-max.

.range-value {
    font-size: range(2rem, 6rem, 48rem, 87.5rem);
}

You can omit $screen-min and $screen-max if passed in your postcssRange config.

.range-value {
    font-size: range(2rem, 6rem);
}

You can also use ratios to calculate the $min-value or $max-value. For ratio suggestions use modularscale.com.

Scaling up using the golden ratio (1.618) from 2rem.

.range-value {
    margin-bottom: range(2rem, 1.618);
}

Scaling down using the golden ratio (1.618) from 6rem.

.range-value {
    margin-bottom: range(1.618, 6rem);
}

In some edge-cases, you may want to reverse the scaling logic, which can be done by passing in a negative ratio.

For the example below, $min-value will be 1.618x larger than $max-value.

.range-value {
    margin-bottom: range(-1.618, 2rem);
}

There is shorthand support for margin, margin-inline, margin-block and padding, padding-inline, padding-block.

.range-value {
    margin: range(2rem, 6rem) auto;
}

.range-value {
    margin: range(1.618, 10rem) range(1.618, 6rem) 2rem 2rem;
}

.range-value {
    font-size: range(2rem, 6rem, 48rem, 87.5rem);
}

.range-value {
    font-size: clamp(2rem, 2rem + (6 - 2) * ((100vw - 48rem) / (87.5 - 48)), 6rem);
}

Please note by default postcss-range-vaue uses clamp(). Browsers that do not support CSS clamp() will not work. You disable the use of clamp() by setting clamp: false in the config, which will revert back to media queries for older browser support.