tw-reset

tw-reset

A "reset" for your Tailwind config that enforces best practices, improves rendering performance, and reduces bundle size.

🤔 Why would I want this?

Tailwind v3's default config includes a bunch of stuff that the authors wanted to change but couldn't because of backwards compatibility (i.e. deprecated flex-shrink utilities, unexpected content path behavior). Tailwind v4 will address all of these, but in the meantime you can modernize & future-proof your existing v3 sites with tw-reset, while reaping some performance benefits and bundle size reductions.

---

Installation

Install the plugin from npm:

npm install -D tw-reset

Then add the preset to your tailwind.config.js file:

module.exports = {
+  presets: [require('tw-reset')],
   // ...
}

[!IMPORTANT] If you're using CSS Modules or <style> tags in Vue/Svelte, pass this option to the preset:

presets: [
  require('tw-reset')({
    optimizeUniversalDefaults: false
  })
]

Read the first section below for more information.

---

What it changes

Optimized universal defaults

By default, Tailwind outputs the following rule to prevent internal CSS variables from inheriting. You may have seen it in your inspector at some point:

*,
::before,
::after {
  --tw-border-spacing-x: 0;
  --tw-border-spacing-y: 0;
  --tw-translate-x: 0;
  --tw-translate-y: 0;
  --tw-rotate: 0;
  --tw-skew-x: 0;
  /* ... */
}

This works, but it's inefficient as it applies to every element on the page even though the variables are only needed in their corresponding utilities.

An alternative strategy is available behind an experimental config flag, which optimizes this output and likely improves the rendering performance of your site:

https://github.com/barvian/tw-reset/assets/868352/39ca9c8c-6ac8-40d3-b97a-3be069a78541

This flag is currently used in production on tailwindcss.com and was initially considered for the default config in Tailwind v3, but was ruled out because it doesn't work with "per-component styles" that cause PostCSS to run multiple times in isolation (i.e. Vue/Svelte <style> tags or CSS Modules). However, Tailwind discourages per-component styles, so tw-reset enables this flag by default, which enforces best practices and brings the other improvements mentioned.

If you must use per-component styles, you can disable this flag with:

// tailwind.config.js
module.exports = {
  presets: [
    require('tw-reset')({
      optimizeUniversalDefaults: false
    })
  ]
}

---

Container queries included by default

Tailwind v4 will support container queries out-of-the-box, so tw-reset includes the official container query plugin that uses the same syntax as Tailwind v4. If you were previously using this plugin, make sure you remove it when adding tw-reset:

module.exports = {
+  presets: [require('tw-reset')],
   plugins: [
-    require('@tailwindcss/container-queries')
   ]
}

---

Removed deprecated utilities

Tailwind currently ships with a few deprecated utilities that still show up in IntelliSense suggestions:

• flex-shrink (replaced by shrink)
• flex-grow (replaced by grow)
• overflow-ellipsis (replaced by text-ellipsis)
• decoration-slice (replaced by box-decoration-slice)
• decoration-clone (replaced by box-decoration-clone)

These deprecated utilities will be removed in Tailwind v4, so they're disabled by default in tw-reset and hidden from IntelliSense.

---

Default borders and rings

Tailwind v4 will change the default border and ring colors to currentColor, which is the browser default. It will also use 1px as the default ring width, and 100% as the default ring opacity. tw-reset implements all these changes, which future-proofs your site for Tailwind v4 and provides more predictable behavior.

---

*-opacity utilities disabled by default

Older versions of Tailwind used *-opacity classes to change the opacity of colors, i.e.

<h1 class="text-black text-opacity-50">...</h1>

These utilities have been removed from Tailwind documentation, replaced by the newer opacity modifier syntax. They'll be disabled by default in Tailwind v4, so tw-reset also disables them by default. This has the pleasant side effect of slightly reducing your CSS bundle size and simplifying the color output:

.border-white {
-  --tw-border-opacity: 1;
-  border-color: rgb(255 255 255 / var(--tw-border-opacity));
+  border-color: #fff;
}
.bg-white {
-  --tw-bg-opacity: 1;
-  background-color: rgb(255 255 255 / var(--tw-bg-opacity));
+  background-color: #fff;
}
.text-white {
-  --tw-text-opacity: 1;
-  color: rgb(255 255 255 / var(--tw-text-opacity));
+  color: #fff;
}

---

Default screens in rem

Tailwind v4 will use rem units for its default breakpoints, which better complement the default font sizes and spacing scales that also use rem. This was initially considered for Tailwind v1, but was ruled out due to Safari bugs at the time. Those bugs have since been fixed, so tw-reset provides rem-based breakpoints as default. This shouldn't cause any changes to your design if you're using Tailwind's default px-based breakpoints.

If you need to refer to these new breakpoints in your code for some reason, you can import them like so:

const { screens } = require('tw-reset/defaultTheme')

---

Relative content paths

tw-reset resolves non-absolute content paths relative to the config file (rather than the current working directory), which "will likely become the default" in Tailwind v4.