twind-logical

A CSS Logical Properties and Values plugin for twind CSS.

Installation

Install from npm:

# Using npm
npm install twind-logical

# Using Yarn
yarn add twind-logical

Usage

Add to plugins of your setup call:

import twindLogical from 'twind-logical'

setup({
  plugins: {
    ...twindLogical,
  },
})

What are CSS Logical Properties and Values?

In short, CSS Logical Properties and Values extend CSS for easier development when working with non-LTR (left-to-right) languages. For example, let's say you want to add padding before the start of a paragraph of text. For English, which is LTR, you would do this:

.lead-paragraph {
  padding-left: 1rem;
}

However, for Farsi, which reads right-to-left, that would cause the padding to be at the end of the text rather than the beginning, so you would have to do something like this to cover both cases:

.lead-paragraph {
  padding-left: 1rem;
}
html[dir='rtl'] .lead-paragraph {
  padding-left: 0;
  padding-right: 1rem;
}

CSS Logical Properties and Values simplifies this by abstracting away the specific directions. The above example becomes this:

.lead-paragraph {
  padding-inline-start: 1rem;
}

With one style, the padding is applied as intended for either language. For more about CSS Logical Properties and Values, see Building Multi-Directional Layouts by Ahmad El-Alfy.

What's Included

Flow-relative Values for float and clear

.float-start {
  float: inline-start;
}
.float-end {
  float: inline-end;
}
.clear-start {
  clear: inline-start;
}
.clear-end {
  clear: inline-end;
}

Flow-relative Values for text-align

.text-start {
  text-align: start;
}
.text-end {
  text-align: end;
}

Flow-relative Values for resize

.resize-block {
  resize: block;
}
.resize-inline {
  resize: inline;
}

Flow-relative Longhands for overscroll-behavior

.overscroll-b-auto {
  overscroll-behavior-block: auto;
}
.overscroll-b-contain {
  overscroll-behavior-block: contain;
}
.overscroll-b-none {
  overscroll-behavior-block: none;
}
.overscroll-i-auto {
  overscroll-behavior-inline: auto;
}
.overscroll-i-contain {
  overscroll-behavior-inline: contain;
}
.overscroll-i-none {
  overscroll-behavior-inline: none;
}

Logical Height and Logical Width

Utilities are generated for the block-size, inline-size, min-block-size, min-inline-size, max-block-size, and max-inline-size properties. These match the values in your height, width, min-height, min-width, max-height, and max-width config objects, respectively.

.bs-1 {
  block-size: 0.25rem;
}
.is-1 {
  inline-size: 0.25rem;
}
.min-bs-0 {
  min-block-size: 0;
}
.min-is-0 {
  min-inline-size: 0;
}
.max-bs-full {
  max-block-size: 100%;
}
.max-is-full {
  max-inline-size: 100%;
}

Flow-relative Margins

Utilities are generated for the margin-block-start, margin-block-end, margin-inline-start, and margin-inline-end properties, as well as for the shorthand properties margin-block and margin-inline. These match the values in your margin config object.

.mlb-1 {
  margin-block: 0.25rem;
}
.mli-1 {
  margin-inline: 0.25rem;
}
.mbs-1 {
  margin-block-start: 0.25rem;
}
.mbe-1 {
  margin-block-end: 0.25rem;
}
.mis-1 {
  margin-inline-start: 0.25rem;
}
.mie-1 {
  margin-inline-end: 0.25rem;
}

Flow-relative Padding

Utilities are generated for the padding-block-start, padding-block-end, padding-inline-start, and padding-inline-end properties, as well as for the shorthand properties padding-block and padding-end. These match the values in your padding config object.

.plb-1 {
  padding-block: 0.25rem;
}
.pli-1 {
  padding-inline: 0.25rem;
}
.pbs-1 {
  padding-block-start: 0.25rem;
}
.pbe-1 {
  padding-block-end: 0.25rem;
}
.pis-1 {
  padding-inline-start: 0.25rem;
}
.pie-1 {
  padding-inline-end: 0.25rem;
}

Flow-relative Space Between

Flow-relative utilities are generated for the Tailwind-specific Space Between. These match the values in your space config object. All of the usual positive and negative values plus .space-b-reverse and .space-i-reverse utilities are generated.

.space-b-1 > :not([hidden]) ~ :not([hidden]) {
  --tw-space-b-reverse: 0;
  margin-block-start: calc(0.25rem * calc(1 - var(--tw-space-b-reverse)));
  margin-block-end: calc(0.25rem * var(--tw-space-b-reverse));
}

.space-i-1 > :not([hidden]) ~ :not([hidden]) {
  --tw-space-i-reverse: 0;
  margin-inline-start: calc(0.25rem * calc(1 - var(--tw-space-i-reverse)));
  margin-inline-end: calc(0.25rem * var(--tw-space-i-reverse));
}

Flow-relative Offsets (top / right / bottom / left)

Utilities are generated for the inset-block-start, inset-block-end, inset-inline-start, and inset-inline-end properties, as well as for the shorthand properties inset-block and inset-inline. These match the values in your inset config object.

.inset-block-0 {
  inset-block: 0;
}
.inset-inline-0 {
  inset-inline: 0;
}
.block-start-0 {
  inset-block-start: 0;
}
.block-end-0 {
  inset-block-end: 0;
}
.inline-start-0 {
  inset-inline-start: 0;
}
.inline-end-0 {
  inset-inline-end: 0;
}

Flow-relative Border Widths

Utilities are generated for the border-block-start-width, border-block-end-width, border-inline-start-width, and border-inline-end-width properties. These match the values in your borderWidth config object.

.border-bs-2 {
  border-block-start-width: 2px;
}
.border-be-2 {
  border-block-end-width: 2px;
}
.border-is-2 {
  border-inline-start-width: 2px;
}
.border-ie-2 {
  border-inline-end-width: 2px;
}

Flow-relative Divide Width

Flow-relative utilities are generated for the Tailwind-specific Divide Width. These match the values in your divideWidth config object. All of the usual values plus .divide-b, .divide-i, .divide-b-reverse and .divide-i-reverse utilities are generated.

.divide-b-2 > :not([hidden]) ~ :not([hidden]) {
  --tw-divide-b-reverse: 0;
  border-block-start-width: calc(2px * calc(1 - var(--tw-divide-b-reverse)));
  border-block-end-width: calc(2px * var(--tw-divide-b-reverse));
}

.divide-i-2 > :not([hidden]) ~ :not([hidden]) {
  --tw-divide-i-reverse: 0;
  border-inline-start-width: calc(2px * calc(1 - var(--tw-divide-i-reverse)));
  border-inline-end-width: calc(2px * var(--tw-divide-i-reverse));
}

Flow-relative Corner Rounding (border-radius)

Utility classes are generated for the border-start-start-radius, border-start-end-radius, border-end-start-radius, and border-end-end-radius properties for rounding individual corners. There are also shorthand utilities for rounding a side of an element. These match the values in your borderRadius config object.

.rounded-bs-md {
  border-start-start-radius: 0.375rem;
  border-start-end-radius: 0.375rem;
}

.rounded-be-md {
  border-end-start-radius: 0.375rem;
  border-end-end-radius: 0.375rem;
}

.rounded-is-md {
  border-start-start-radius: 0.375rem;
  border-end-start-radius: 0.375rem;
}

.rounded-ie-md {
  border-start-end-radius: 0.375rem;
  border-end-end-radius: 0.375rem;
}

.rounded-ss-md {
  border-start-start-radius: 0.375rem;
}
.rounded-se-md {
  border-start-end-radius: 0.375rem;
}
.rounded-es-md {
  border-end-start-radius: 0.375rem;
}
.rounded-ee-md {
  border-end-end-radius: 0.375rem;
}

What's Not Included

While everything in the CSS Logical Properties and Values Level 1 specification has been evaluated and most features are supported, this plugin does not generate utilities for everything. If something does not have a non-logical equivalent in Tailwind's defaults, it is not supported.

• Logical Values for the caption-side property: Tailwind does not have caption-side utilities.
• Flow-relative Border Width shorthand properties border-block-width and border-block-height: Tailwind does not have border-width shorthand utilities for the X or Y axis.
• Flow-relative Border Styles: Tailwind only has border-style utilities for all sides of an element at once.
• Flow-relative Border Colors: Same as for Border Styles.

As for other logical properties and values from outside of the main specification:

• Flow-relative Overflow properties overflow-block and overflow-inline: while Tailwind does support overflow, this plugin does not support overflow-block or overflow-inline yet, due to a lack of browser support and polyfills. As of March 2021, only Firefox supports them, and as far as I can tell there are no polyfills available. (Neither postcss-preset-env nor postcss-logical apply any transformations on these properties.)

If there are any notable omissions that you think should be supported, please file an issue and let me know.

Browser Compatibility

CSS Logical Properties and Values is a fairly new (and still evolving) specification, so browser support varies. None of the logical properties and values are supported in Internet Explorer 11, and some, such as Flow-relative Offsets and Corner Rounding, are currently only supported in Firefox and Chrome as of March 2021.

If some utilities don't seem to work correctly, be sure to check Can I use... to see if that property or value is supported by your browser.

Credits

tailwindcss-logical