Built-in PurgeCSS Comes To Tailwind v1.4

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Built-in PurgeCSS Comes To Tailwind v1.4 image

Adam has been on fire the last couple weeks releasing new features and improvements to Tailwind. This week, Tailwind v1.4 has been released with new color opacity utilities, an IE 11 target mode, and built-in PurgeCSS support.

Color Opacity Utilities

The new color opacity utilities allow you to control the opacity of colors without explicitly defining the variations in your config file. Previously, if you wanted to make a semi-transparent black background, you’d have to add something like black-.5: 'rgba(0, 0, 0, 0.5)' to the colors object in your tailwind.config.js file. Now, you can use bg-black bg-opacity-50 to achieve the same thing directly in your markup!

Opacity utilities have been added for background colors, text colors, border colors, divide colors, and placeholder colors.

Note: this feature is not fully compatible with IE 11, but does provide a graceful fallback.

Built-in PurgeCss

PurgeCSS is a Post CSS plugin that can optionally be set up along with Tailwind to remove any unused CSS classes that aren’t used anywhere in your markup. Pre-Tailwind v1.4, you’d have to manually set it up in your build pipeline and be sure to configure it to properly work with Tailwind. Tailwind v1.4 includes PurgeCSS by default! For the basic (most common setup), all you have to do is add a purge key to your tailwind.config.js file and pass it an array of paths to your markup.

// tailwind.config.js
module.exports = {
purge: [
'./src/**/*.html',
'./src/**/*.vue',
'./src/**/*.jsx',
],
theme: {},
variants: {},
plugins: [],
}

In most cases, that set up will work great, but if you need to pass additional options to PurgeCSS you can easily do that. Read the “Removing unused CSS” section in the docs to learn about all the options.

IE 11 Target Mode

Some of the latest features introduced in Tailwind have not been fully IE 11 compatible because of the use of CSS variable and custom properties. Previously it’s been left up to Tailwind users to remember which features those are and to not use them.

Tailwind v1.4 has introduced a new experimental IE 11 target mode that will remove features that aren’t compatible with Tailwind or gracefully degrade them to simpler versions in some cases.

To use it, add target: 'ie11 to your tailwind.config.js file and recompile your CSS.

// tailwind.config.js
module.exports = {
target: 'ie11',
theme: {},
variants: {},
plugins: [],
}

Since this feature is marked as experimental, use it at your own risk. Adam has reserved the right to make breaking changes outside of normal semantic versioning policies.

Conclusion

As always, read the Release Notes and documentation for each of these new features to find out more!

Jason Beggs photo

TALL stack (Tailwind CSS, Alpine.js, Laravel, and Livewire) consultant and owner of roasted.dev.

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