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fluid-text-plugin

A fluid-text plugin for Tailwind, UnoCSS, and as utility functions for other ecosystems.


Web designs are often polished & delivered targeting your largest mobile, tablet, and desktop view widths.

Heading font sizes are desgined to fit well at those specific sizes.

Hand it to a developer and that's what you'll get at those sizes.

What happens right after the largest tablet layout though? - A squished desktop layout with font sizes designed for more shoulder room. - Headers wrap, layout stretches vertically, designers weep, developers can't do much to help.

Until now...

Our fluid-text-plugin gives your team a single Tailwind* class name solution to this challenge.

* also works with UnoCSS and as an independent utility you can call without needing any build system at all.

animated example of fluid text changing size in a resizing window

Testimonials

Oh my god, perfect! THANK YOU!

~ Bitovi Designer

🐥 to @JaneOri for showing me what I honestly feel like will become an industry-wide, common practice related to styling text. It hits that sweet spot of being extremely useful while also being simple and easy to use. I see myself using it for every project I start in the future.

~ Bitovi Developer

Need help or have questions?

This project is supported by Bitovi. You can get help or ask questions on our:

Or, you can hire us for training, consulting, or development. Set up a free consultation.

Setup

npm install fluid-text-plugin

Tailwind Plugin

In your tailwind.config.js file:

  const plugin = require('tailwindcss/plugin')
  const { fluidText } = require('fluid-text-plugin/fluid-text')

  module.exports = {
    // ...
    plugins: [
      plugin(fluidText.tailwind.plugin),
    ]
  }

Then use the fluid-text utility class anywhere you use tailwind:

fluid-text-[4-7-sm-6-md-4-7-xl]

UnoCSS Plugin

In your uno.config.js file:

  import { defineConfig } from 'unocss'
  import { fluidText } from 'fluid-text-plugin/fluid-text'

  export default defineConfig({
    // ...
    preflights: [
      ...fluidText.uno.preflights
    ],
    rules: [
      ...fluidText.uno.rules
    ]
  })

Then use the fluid-text utility class anywhere you use UnoCSS:

fluid-text-[4-7-sm-6-md-4-7-xl]

The square brackets around the value are optional in UnoCSS.

Usage

fluid-text-[4-7-sm-6-md-4-7-xl]

The numbers are 1/4 the pixel size, like many other number values in Tailwind.

The breakpoint names and positions are taken from your Tailwind (or UnoCSS) configuration, which may just be the following defaults:

{
  'sm': '640px',
  'md': '768px',
  'lg': '1024px',
  'xl': '1280px',
  '2xl': '1536px'
}

Currently, only px breakpoints are supported.

One number between breakpoints means hold that size the whole range.

The behavior of this class fluid-text-[4-6-sm-md-4-9-lg] is:

  • If the screen is 0 width, the font size is 4 (x 4px).
  • From 0, the font-size will increase up to 6 (x 4px) until right before the sm breakpoint.
  • Between sm and md, the size will not grow but remain 6.
  • Right after the md breakpoint, the size becomes 4 and grows to 9, reaching 9 at the lg breakpoint.

Ommitting -lg means the font will reach size 9 as soon as the screen hits your largest breakpoint.

Scaling other values

1em is equal to the current fluid font-size so you can adjust paddings, margins, etc with em units to participate in the fluidity.

If you need to scale decendant's properties relative to the fluid container's font size, like if a fixed-size text-based 16px-icon is on your ::before pseudo, but its padding needs to scale, you can use the --fluid-em var and CSS calc() to set it.

Using the utility functions without Tailwind or UnoCSS

  import { fluidText } from 'fluid-text-plugin/fluid-text'

  const myBPs = { 'mobile': '640px', 'tablet': '968px', 'desktop': '1224px', 'battlestation': '1536px' }

  const globalCSSToInject = fluidText.utility.globalStyles(myBPs).txt
  // instead of .txt, you can use .obj if you have a css-in-js setup.

  const inlineHeadingStyles = {
    // ...
    md: fluidText.utility.style("4-7-sm-6-md-4-7-xl", myBPs).txt,
    // ...
  }
  // use .obj instead if you have a css-in-js solution or are using React
  // style={fluidText.utility.style("4-7-sm-6-md-4-7-xl", myBPs).obj}

For utility usage, any element you apply the style to will also need a fluid-text class to pick up the global CSS.

To change the class name needed, pass a selector string as the second parameter to the globalStyles function. The default is ".fluid-text".

Running Our Tests

To run tests after cloning the repo and installing the dev dependencies, run:

npm run buildtests

This installs tailwind and uno in the corresponding test folders and copies the test/index.html file into each test directory.

Then run:

npm run test

We want to hear from you.

Come chat with us about open source in our Bitovi community Discord.

See what we're up to by following us on Twitter.