tailwindcss-vanilla-rtl

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tailwindcss-vanilla-rtl

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Simple right-to-left (RTL) language support, switching vanilla Tailwind utilities to CSS logical properties and values.

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# [tailwindcss-vanilla-rtl](https://www.npmjs.com/package/tailwindcss-vanilla-rtl) [<img src="https://raw.githubusercontent.com/thibaudcolas/tailwindcss-vanilla-rtl/main/.github/tailwind-logo.svg?sanitize=true" alt="Tailwind" width="90" height="90" align="right">](https://tailwindcss.com/)

Simple right-to-left (RTL) language support for Tailwind, switching vanilla utilities to [CSS logical properties and values](https://rtlstyling.com/posts/rtl-styling#css-logical-properties).

## Usage

This plugin overrides Tailwind’s core’s utility classes, making it very straightforward to add RTL support. Have a look at the [browser support](#browser-support), [design decisions](#design-decisions), and [alternatives](#alternatives) to validate whether this is the right fit for your project. Take a look at the [demo site](https://thibaudcolas.github.io/tailwindcss-vanilla-rtl/)

Install the package, add it to the `plugins`, and disable the `corePlugins` it overrides.

```bash
npm install tailwindcss-vanilla-rtl --save-dev
```

```js
const vanillaRTL = require("tailwindcss-vanilla-rtl");

module.exports = {
  plugins: [
    // Place at the top of `plugins` so other plugins can override the CSS just like they would for core utilities:
    vanillaRTL,
    // […]
  ],
  corePlugins: {
    ...vanillaRTL.disabledCorePlugins,
  },
};
```

That’s it. Since the plugin uses the same utility classes as Tailwind core (`ml-4`, `px-10`, etc.), there’s no code to change, no new utilities to learn. Make sure the plugin is at the top of the `plugins` list so its output can be overridden by other utilities, just like would be the case with Tailwind core plugins.

The plugin is compatible with Tailwind v3.2 and up. For compatibility with older releases of Tailwind (starting with v3.0), use older releases of the package. See our [CHANGELOG](https://github.com/thibaudcolas/tailwindcss-vanilla-rtl/blob/main/CHANGELOG.md) to learn which release is compatible with each version of Tailwind.

## Browser support

Browser support for CSS logical properties and values is somewhat recent. This plugin has full support for Safari 15, Chrome/Edge 89, and Firefox 68.

To provide full support for RTL languages, consider using [postcss-logical](https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical). Note that postcss-logical will create styles with `[dir=rtl]` and `[dir=ltr]` attribute selectors, which will have a higher specificity than single-class utilities, and risk behaving differently when combined with non-utility CSS.

Here are specific properties with very recent browser support to keep in mind:

- [border-radius](https://caniuse.com/?search=border-start-start-radius):
  - macOS Safari 15 (2021-09-21) and up
  - iOS Safari 15.1 (2021-09-21) and up
  - Chrome 89 (2021-03-01) and up
  - Edge 89 (2021-03-04) and up
  - Firefox 66 (2019-03-19) and up
- [scroll-padding](https://caniuse.com/?search=scroll-padding-inline-start):
  - macOS Safari 15 (2021-09-21) and up
  - iOS Safari 15.1 (2021-09-21) and up
  - Chrome 69 (2018-09-04) and up
  - Edge 79 (2020-01-15) and up
  - Firefox 68 (2019-07-09) and up
- [`left` / `right` positioning](https://caniuse.com/?search=inset-inline-start):
  - macOS Safari 14.1 (2021-04-26) and up
  - iOS Safari 14.5 (2021-04-26) and up
  - Chrome 87 (2020-11-17) and up
  - Edge 87 (2020-11-20) and up
  - Firefox 63 (2018-10-23) and up
- [scroll-margin](https://caniuse.com/?search=scroll-margin-inline-start):
  - macOS Safari 14.1 (2021-04-26) and up
  - iOS Safari 14.5 (2021-04-26) and up
  - Chrome 69 (2018-09-04) and up
  - Edge 79 (2020-01-15) and up
  - Firefox 68 (2019-07-09) and up

## Compatibility with other plugins

This plugin works with any other as long as it’s placed _first_ in the `plugins` list. Or at least above other plugins that add utilities using the same CSS properties. This is so the [CSS source order](https://developer.mozilla.org/en-US/docs/Web/CSS/Cascade#cascading_order) is the same as with core plugins.

For full RTL support, any additional plugin should also use CSS logical properties and values.

## Design decisions

- [RTL only](#rtl-only)
- [Vanilla utility class names](#vanilla-utility-class-names)
- [Vanilla functionality](#vanilla-functionality)
- [No float support](#no-float-support)
- [Tailwind corePlugins copy-paste](#tailwind-coreplugins-copy-paste)

### RTL only

We only use logical properties and values that pertain to left and right styles, not top/bottom. Although this would be possible, we believe it’s rare enough for UI components to need to support all of LTR, RTL, and [top-to-bottom (TTB) languages](https://www.w3.org/International/questions/qa-scripts#directions) (Simplified Chinese, Traditional Chinese, Japanese, Korean) interchangeably. It’s also more complex to support a 90º rotation in text direction – all styles need to be written with logical properties and values.

### Vanilla utility class names

This plugin retains Tailwind’s utility class names for layout, even though they are changed to output CSS logical properties and values. Retaining the same class names means less to learn and no code to change, but it implies that:

- It’s not apparent from the classes alone that a component is built for RTL support.
- There is no way to mix and match physical and logical styles within a given project – it’s completely impossible to write physical direction or dimension styles.
- Code is authored from the LTR languages’ perspective (even if both LTR and LTR are supported).

### Vanilla functionality

Aside from the properties and values used, this plugin does not change the way Tailwind works. It does not add new utilities, nor does it change the way utilities are generated. For example, this plugin doesn’t help with [flow-relative `transform`](https://github.com/w3c/csswg-drafts/issues/1544). Those will need to be manually reversed.

Here are specific properties which aren’t covered and will need reversing manually:

- `transform` / `translate`, because CSS itself [doesn’t support flow-relative logical values](https://github.com/w3c/csswg-drafts/issues/1544).
- `background-position` – also not a thing in CSS (work in progress). See [CSS Backgrounds and Borders Module Level 4](https://drafts.csswg.org/css-backgrounds-4/#the-background-position), [Firefox #1732171](https://bugzilla.mozilla.org/show_bug.cgi?id=1732171), [WebKit #218094](https://bugs.webkit.org/show_bug.cgi?id=218094).
- Angles in gradients, also because of a lack of [flow-relative gradients](https://github.com/w3c/csswg-drafts/issues/1724) in CSS.
- `caption-side` – not supported by Tailwind.
- `float` and `clear` – see [No float support](#no-float-support).

### No float support

As of now, there is very little browser support for [flow-relative float values](https://caniuse.com/mdn-css_properties_float_flow_relative_values) (`float: inline-start` and `float: inline-end`). We recommend to avoid float layouts entirely, by disabling the corresponding core plugins:

```js
module.exports = {
  corePlugins: {
    // […]
    float: false,
    clear: false,
  },
};
```

Flow-relative `float` and `clear` are apparently [getting support in Safari TP 158](https://caniuse.com/mdn-css_properties_float_flow_relative_values) (according to [MDN’s browser feature detection](https://github.com/mdn/browser-compat-data/pull/18268), not covered in the [TP 158 release notes](https://webkit.org/blog/13584/release-notes-for-safari-technology-preview-158/)). We’ll revisit this decision when support si clearer.

### Tailwind corePlugins copy-paste

All utilities generated with this plugin are built with a copy-paste of Tailwind’s own [corePlugins.js](https://github.com/tailwindlabs/tailwindcss/blob/master/src/corePlugins.js). This is to simplify maintenance – as we override core plugins, it’s important for our utilities to match Tailwind’s like-for-like. Defining plugins with the least changes from core allows us to use git conflict resolution when merging in corePlugins changes in newer releases.

## Alternatives

There are a lot of interesting alternatives worth considering.

### Upcoming Tailwind support

Follow the conversation in Tailwind discussion [#1483 \[Feature Proposal\] CSS Logical Properties](https://github.com/tailwindlabs/tailwindcss/discussions/1483) and pull request [#10166 Add logical properties support for inline direction](https://github.com/tailwindlabs/tailwindcss/pull/10166).

### tailwindcss-rtl

[tailwindcss-rtl](https://github.com/20lives/tailwindcss-rtl) introduces new utility classes using CSS logical properties and values for RTL support. It’s a good alternative for projects wanting to:

- Use different utilities from those of Tailwind core, to make RTL support more explicit.
- Author styles in a language-agnostic way, rather than the LTR perspective.

Since tailwindcss-rtl uses separate classes, it’s possible to mix and match with existing left/right/top/bottom utilities. It’s however not possible to fully disable those utilities, since they have to be used for top/bottom positioning.

### tailwindcss-logical

[tailwindcss-logical](https://github.com/stevecochrane/tailwindcss-logical) introduces new utility classes to support all CSS logical properties and values, for RTL as well as TTB support. It’s an excellent alternative for projects that want to:

- Use different utilities form those of Tailwind core, to make RTL support more explicit.
- Write _all_ layout styles with logical properties and values (for TTB scripts support), not just LTR-RTL mirroring.
- Author styles in a language-agnostic way, rather than the LTR perspective.

Since tailwindcss-logical uses separate classes, it’s possible to mix and match with existing left/right/top/bottom utilities. It’s also possible to fully disable the corresponding core utilities, to ensure logical properties and values are used consistently.

### Tailwind 3.0 built-in RTL support

[Tailwind’s built-in RTL support](https://tailwindcss.com/docs/hover-focus-and-other-states#rtl-support) is based on `rtl:` and `ltr:` modifiers. The only advantage of this approach is in how explicit it is, but it’s also very verbose and error-prone to always have to separately add mirrored styles.

### Comparison table

This comparison table reviews utility class names across Tailwind plugins built with [CSS logical properties and values](https://rtlstyling.com/posts/rtl-styling#css-logical-properties).

| tailwindcss-vanilla-rtl                                           | tailwindcss-rtl | tailwindcss-logical |
| ----------------------------------------------------------------- | --------------- | ------------------- |
| **[Margin](https://tailwindcss.com/docs/margin)**                 |                 |                     |
| `mx-0`                                                            | N/A             | `mli-0`             |
| `mr-0`                                                            | `me-0`          | `mie-0`             |
| `ml-0`                                                            | `ms-0`          | `mis-0`             |
| **[Padding](https://tailwindcss.com/docs/padding)**               |                 |                     |
| `px-0`                                                            | N/A             | `pli-0`             |
| `pr-0`                                                            | `pe-0`          | `pie-0`             |
| `pl-0`                                                            | `ps-0`          | `pis-0`             |
| **[Inset](https://tailwindcss.com/docs/top-right-bottom-left)**   |                 |                     |
| `inset-0`                                                         | N/A             | N/A                 |
| `inset-x-0`                                                       | N/A             | `inset-inline-0`    |
| `right-0`                                                         | `end-0`         | `inline-end-0`      |
| `left-0`                                                          | `start-0`       | `inline-start-0`    |
| **[Space Between](https://tailwindcss.com/docs/space)**           |                 |                     |
| `space-x-0`                                                       | N/A             | `space-i-0`         |
| **[Scroll Margin](https://tailwindcss.com/docs/scroll-margin)**   |                 |                     |
| `scroll-mx-0`                                                     | N/A             | N/A                 |
| `scroll-mr-0`                                                     | N/A             | N/A                 |
| `scroll-ml-0`                                                     | N/A             | N/A                 |
| **[Scroll Padding](https://tailwindcss.com/docs/scroll-padding)** |                 |                     |
| `scroll-px-0`                                                     | N/A             | N/A                 |
| `scroll-pr-0`                                                     | N/A             | N/A                 |
| `scroll-pl-0`                                                     | N/A             | N/A                 |
| **[Border Radius](https://tailwindcss.com/docs/border-radius)**   |                 |                     |
| `rounded-t-0`                                                     | N/A             | `rounded-bs-0`      |
| `rounded-r-0`                                                     | `rounded-e-0`   | `rounded-ie-0`      |
| `rounded-b-0`                                                     | N/A             | `rounded-be-0`      |
| `rounded-l-0`                                                     | `rounded-s-0`   | `rounded-is-0`      |
| `rounded-tl-0`                                                    | `rounded-ts-0`  | `rounded-ss-0`      |
| `rounded-tr-0`                                                    | `rounded-te-0`  | `rounded-se-0`      |
| `rounded-br-0`                                                    | `rounded-be-0`  | `rounded-ee-0`      |
| `rounded-bl-0`                                                    | `rounded-bs-0`  | `rounded-es-0`      |
| **[Border Width](https://tailwindcss.com/docs/border-width)**     |                 |                     |
| `border-x-0`                                                      | N/A             | `border-li-0`       |
| `border-r-0`                                                      | `border-e-0`    | `border-ie-0`       |
| `border-l-0`                                                      | `border-s-0`    | `border-is-0`       |
| **[Border Color](https://tailwindcss.com/docs/border-color)**     |                 |                     |
| `border-x-black`                                                  | N/A             | `border-li-black`   |
| `border-r-black`                                                  | N/A             | `border-ie-black`   |
| `border-l-black`                                                  | N/A             | `border-is-black`   |
| **[Divide Width](https://tailwindcss.com/docs/divide-width)**     |                 |                     |
| `divide-x-0`                                                      | N/A             | `divide-i-0`        |
| **[Text Align](https://tailwindcss.com/docs/text-align)**         |                 |                     |
| `text-right`                                                      | `text-end`      | `text-end`          |
| `text-left`                                                       | `text-start`    | `text-start`        |

## Keeping up with Tailwind releases

This project’s plugins definition is a copy-paste of Tailwind’s `corePlugins.js`, with the least possible changes to use logical properties and values.

Parts of `corePlugins.js` which shouldn’t be redefined by this plugin are commented out, so the line-by-line diff with the official file is as small as possible. This makes it straightforward to keep this plugin compatible with releases, by making a diff of the changes and applying them the customised `corePlugins.js`.

1. Checkout the first commit, where `corePlugins.js` was initially copied as-is: `git checkout 2aa1d21`.
2. Copy the `corePlugins.js` file for that release, for example `wget https://raw.githubusercontent.com/tailwindlabs/tailwindcss/v3.1.8/src/corePlugins.js`.
3. Paste the official `corePlugins.js` into the repository’s corePlugins.js file: `cp corePlugins.js src/`
4. Generate a patch with `git diff > corePlugins.patch`.
5. Go back to the main branch with `git checkout -- src/corePlugins.js && git checkout main`.
6. Apply the patch with `git apply --3way --whitespace=fix corePlugins.patch`.
7. Fix any conflicts or other issues (with closing comments in particular).
8. Review all occurrences of `left` and `right` in the file to double check they are all accounted for.

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