DEV Community: FSCSS

I built a 5-page portfolio site without writing a single line of HTML or CSS

FSCSS — Sun, 07 Jun 2026 13:24:32 +0000

Not a no-code tool. Not a drag-and-drop builder. Just a JavaScript function and a config object.

Here's the entire setup for a working animated page:

<div id="app-root"></div>
<script>
  devtemDesign("app-root", {
    template: "cyber",
    logoName: "MY BRAND",
    heroTitleLine1: "Build fast.",
    heroTitleLine2: "Ship beautiful.",
    heroSubtitle: "No HTML. No CSS. Just config.",
    primaryBtnText: "Get Started",
    features: [
      { title: "Zero boilerplate", desc: "Nav, hero, footer — all rendered from your config." },
      { title: "4 live themes",    desc: "Switch the whole visual language with one token." }
    ]
  });
</script>

That renders a full page. Animated navbar. Glassmorphism cards. Ambient orb backgrounds. Custom cursor. Scroll reveal. A professional footer. All of it.

The problem I was solving

Every time I started a new landing page or portfolio, I was writing the same things. A fixed glass nav. A hero section with some gradient text. Feature cards. A footer with columns and social icons. Ambient background effects. Custom cursor.

It's not hard work. It's just repetitive. And the repetition compounds — by the time you're on your third or fourth project, you're copy-pasting from your own old work and spending more time renaming CSS classes than actually designing.

So I built devtemDesign to abstract all of it behind a config schema.

How it works

You call one function. You pass it a container ID and a config object. The engine reads the config and constructs the full page DOM — nav, hero, marquee ticker, features grid, panels, footer — and wires up all the interactions.

The visual theme is controlled by a single template token:

devtemDesign("app-root", {
  template: "figsh", // or "cyber", "aurora", "monochrome"
  ...
})

Each template injects a complete set of CSS custom properties onto :root. Every component in the engine reads from those variables, so swapping "cyber" to "aurora" changes the entire colour language of the page — backgrounds, borders, accents, glass effects — in one character change.

The footer took the longest to design

The footer schema is the part I'm most proud of. It's fully declarable:

footer: {
  tagline: "Crafting digital experiences that move people.",
  columns: [
    {
      heading: "Product",
      links: [
        { label: "Docs",      href: "/docs"    },
        { label: "Changelog", href: "/changelog" }
      ]
    },
    {
      heading: "Company",
      links: [
        { label: "About",   href: "/about"   },
        { label: "Contact", href: "/contact" }
      ]
    }
  ],
  social: [
    { icon: "fab fa-github",  href: "https://github.com/you", label: "GitHub"  },
    { icon: "fab fa-twitter", href: "https://twitter.com/you", label: "Twitter" }
  ],
  legal: [
    { label: "Privacy Policy", href: "/privacy" },
    { label: "Terms",          href: "/terms"   }
  ],
  copy: "© 2026 Your Name"
}

Two-zone layout. Brand column with tagline and social icons on the left. Link columns on the right. Legal strip at the bottom. Hover animations, focus states, mobile stacking — all handled.

The 5-page portfolio

To test the engine properly, I built a complete 5-page portfolio template — Home, About, Work, Services, Contact — using devtemDesign as the shell on every page.

The trick is a shared config file:

// kaelnova-config.js
window.KN = {
  template: "figsh",
  logoName: "KAEL NOVA",
  navLinks: [
    { label: "Home",     href: "index.html"    },
    { label: "About",    href: "about.html"    },
    { label: "Work",     href: "work.html"     },
    { label: "Services", href: "services.html" },
    { label: "Contact",  href: "contact.html"  }
  ],
  footer: { /* shared footer config */ }
};

KN.boot = function(overrides) {
  devtemDesign("app-root", Object.assign({}, KN, overrides));
};

Every page calls KN.boot({}) with only its page-specific overrides. The nav, footer, logo, and theme are inherited automatically. Change the brand name in one place and it updates across all five pages.

The engine renders the nav and footer. Each page then injects its own content into the DOM after the engine runs — a hero, a timeline, a filterable project grid, a contact form. None of that required touching the engine itself.

What I didn't write

To be specific about what the config abstraction actually saved me:

The glass navbar with slide-down animation, hamburger menu, and mobile drawer
The ambient orb background layer with drift keyframes
The custom magnetic cursor with ring lag and ripple click effect
The scroll reveal IntersectionObserver setup
The marquee ticker
The footer — all columns, hover states, social icons, legal strip, responsive stacking

That's roughly 600 lines of CSS and 200 lines of JS I didn't write per project. On a 5-page site, that's a meaningful difference.

No build step

The CDN setup is two lines:

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/devtemdesign@0.0.2/style.css">
<script src="https://cdn.jsdelivr.net/npm/devtemdesign@0.0.2/script.js"></script>

No Node. No bundler. No framework. Open the HTML file in a browser and it works. Deploy it to Netlify by dragging a folder and it works. The whole template is 7 files and 22KB zipped.

The limits

I want to be honest — there are real tradeoffs.

The config schema is opinionated. The page structure is fixed: nav, hero, marquee, features, panels, footer. If your design needs something outside that structure, you're injecting it manually after the engine runs, which is what I did for the portfolio pages.

It's also not a replacement for actually learning HTML and CSS. The engine is useful precisely because someone who knows those things built the components carefully. If you want to customise beyond the config, you need to understand what's underneath.

And right now there are only four templates. More are coming — along with enableParallax, custom CSS variable overrides, and new section types.

Try it

Github: https://github.com/devtem-dev/devtemDesign

The sandbox at design.devtem.org/sandbox lets you edit a live config and see it render in an iframe — template switcher included.

The full schema reference is at design.devtem.org/api.

The Kael Nova portfolio template is listed on DevTemple if you want the 5-page starter to pull apart.

Just grab the CDN and start editing a config object. That's the whole pitch.

JavaScript Number Formatting — The Complete Guide for Beginners

FSCSS — Sat, 30 May 2026 01:05:09 +0000

Learn every JavaScript number formatting method you actually need — toFixed, toPrecision, toLocaleString, Intl.NumberFormat, Math utilities and the traps to avoid.

Numbers are everywhere in web apps — prices, scores, statistics, percentages, progress bars. But JavaScript stores all numbers as 64-bit floating point values, and raw floating point results look terrible to users.

This is what I mean:

console.log(0.1 + 0.2);
// 0.30000000000000004

That is not a bug. That is how binary floating point math works. The fix is not to change how JavaScript stores numbers — it is to control how you display them. That is what number formatting is.

By the end of this article you will know every method you need, when to use each one, and the traps that trip up beginners.

What Is Number Formatting?

Number formatting is the process of converting a raw numeric value into a string that is readable, consistent, and appropriate for your audience.

Raw value vs formatted output:

Raw Value	Formatted Output	Context
`1234567.8`	`1,234,567.80`	E-commerce price
`0.875`	`87.5%`	Progress indicator
`1500000`	`1.5M`	Social media count
`255`	`#ff`	Hex colour code
`3.14159265`	`3.14`	Display result

Formatting is purely cosmetic — the underlying number never changes. You are just deciding how it looks.

1. toFixed() — Controlling Decimal Places

toFixed(n) rounds a number to n decimal places and returns a string.

let price = 9.999;
console.log(price.toFixed(2));
// "10.00"

let score = 3.14159;
console.log(score.toFixed(3));
// "3.142"

let whole = 7;
console.log(whole.toFixed(2));
// "7.00"

Real-world uses

// Currency
let total = 24.5;
console.log("$" + total.toFixed(2));
// "$24.50"

// Percentage
let progress = 0.876;
console.log((progress * 100).toFixed(1) + "%");
// "87.6%"

The trap beginners hit

toFixed() returns a string, not a number. If you try to add to it, JavaScript will concatenate instead of add:

// Wrong
let x = (1.5).toFixed(2) + 1;
console.log(x);
// "1.501"  ← string concatenation!

// Right
let x = Number((1.5).toFixed(2)) + 1;
console.log(x);
// 2.5  ← actual addition

Always wrap in Number() if you need to do more math after formatting.

2. toPrecision() — Significant Figures

toPrecision(n) formats a number to n total significant digits — counting both sides of the decimal point. Also returns a string.

let n = 123.456;
console.log(n.toPrecision(5));
// "123.46"

let small = 0.00123;
console.log(small.toPrecision(2));
// "0.0012"

let big = 9876543;
console.log(big.toPrecision(4));
// "9877000"

toFixed vs toPrecision — what is the difference?

let n = 3.14159;

console.log(n.toFixed(2));      // "3.14"  → 2 decimal places
console.log(n.toPrecision(4));  // "3.142" → 4 total digits

Use toFixed() for currency, scores, and everyday decimals.
Use toPrecision() for scientific or measurement data where total precision matters more than decimal places.

3. toString() — Base Conversion

toString(radix) converts a number to a string. Pass a base (radix) to convert to binary, octal, hexadecimal, and more.

let n = 255;

console.log(n.toString());    // "255"       — decimal (default)
console.log(n.toString(2));   // "11111111"  — binary
console.log(n.toString(8));   // "377"       — octal
console.log(n.toString(16));  // "ff"        — hex

Practical use — generating hex colours

function toHex(r, g, b) {
  return "#" +
    r.toString(16).padStart(2, "0") +
    g.toString(16).padStart(2, "0") +
    b.toString(16).padStart(2, "0");
}

console.log(toHex(255, 165, 0));
// "#ffa500"

4. toLocaleString() — Human-Friendly Numbers

toLocaleString() formats a number according to language and regional settings. It automatically adds commas, the right decimal separator, and currency symbols — no manual string splitting needed.

let big = 1234567.89;

// Automatic locale (user's browser settings)
console.log(big.toLocaleString());
// "1,234,567.89"  (in US locale)

// Explicit locale
console.log(big.toLocaleString("de-DE"));
// "1.234.567,89"  (German — note the period/comma swap)

// Naira currency
console.log(big.toLocaleString("en-NG", {
  style: "currency",
  currency: "NGN"
}));
// "₦1,234,567.89"

This is the easiest way to add commas to large numbers for display.

5. Intl.NumberFormat — The Production-Grade Way

Intl.NumberFormat is the full standards-based API for number formatting. It is more powerful than toLocaleString() and significantly faster when you are formatting the same style repeatedly (because you create the formatter once and reuse it).

Basic usage

const fmt = new Intl.NumberFormat("en-US");
console.log(fmt.format(1234567));
// "1,234,567"

Currency

const usd = new Intl.NumberFormat("en-US", {
  style: "currency",
  currency: "USD",
});
console.log(usd.format(9.5));
// "$9.50"

Percentage

const pct = new Intl.NumberFormat("en-US", {
  style: "percent",
  minimumFractionDigits: 1,
});
console.log(pct.format(0.756));
// "75.6%"

Compact notation — dashboard and social style

const compact = new Intl.NumberFormat("en-US", {
  notation: "compact",
});
console.log(compact.format(1500000));  // "1.5M"
console.log(compact.format(48000));    // "48K"
console.log(compact.format(999));      // "999"

Controlling digit lengths

const precise = new Intl.NumberFormat("en-US", {
  minimumFractionDigits: 2,
  maximumFractionDigits: 4,
});
console.log(precise.format(1.5));      // "1.50"
console.log(precise.format(1.56789));  // "1.5679"

Intl.NumberFormat is supported in all modern browsers and Node.js. Use it for any production app.

6. Math Utilities — Rounding Before You Format

Before formatting, you often need to round a number first. These are the key Math methods:

Math.round(4.6)   // 5  — nearest integer
Math.round(4.4)   // 4

Math.floor(4.9)   // 4  — always rounds DOWN
Math.floor(-4.1)  // -5

Math.ceil(4.1)    // 5  — always rounds UP
Math.ceil(-4.9)   // -4

Math.trunc(4.9)   // 4  — removes decimals, no rounding
Math.trunc(-4.9)  // -4  — note: not the same as floor for negatives

Math.abs(-42)     // 42 — removes the minus sign
Math.max(1, 9, 3) // 9
Math.min(1, 9, 3) // 1
Math.pow(2, 8)    // 256

Rounding to N decimal places reliably

toFixed(2) can have precision issues in edge cases. For actual math (not just display), this is more reliable:

// Round to 2 decimal places
function round2(n) {
  return Math.round(n * 100) / 100;
}

console.log(round2(1.005));  // 1.01
console.log(round2(2.675));  // 2.68

7. Common Mistakes to Avoid

Mistake 1 — Floating point comparison

// Wrong
console.log(0.1 + 0.2 === 0.3);
// false

// Right — use a tolerance
console.log(Math.abs(0.1 + 0.2 - 0.3) < 0.0001);
// true

Never compare floating point numbers with ===. Always use a small tolerance.

Mistake 2 — Not guarding against NaN

// Wrong
let x = parseInt("hello");
console.log(x.toFixed(2));
// NaN — and can crash your UI

// Right
let val = parseInt("hello");
if (!isNaN(val)) {
  console.log(val.toFixed(2));
}

Always check isNaN() before calling formatting methods on values that came from user input or external data.

Mistake 3 — Parsing a formatted string

// Wrong — this breaks
let price = "$1,234.50";
let num = parseFloat(price);
console.log(num);
// NaN

// Right — strip formatting first
let clean = price.replace(/[^0-9.]/g, "");
let num = parseFloat(clean);
console.log(num);
// 1234.5

If you need to parse a number back out of a formatted string, strip the non-numeric characters first.

Quick Reference

Method	Returns	Best for
`toFixed(n)`	string	Prices, decimals
`toPrecision(n)`	string	Scientific data
`toString(radix)`	string	Base conversion, hex
`toLocaleString()`	string	Commas, quick locale
`Intl.NumberFormat`	formatter object	Production apps
`Math.round()`	number	Nearest integer
`Math.floor()`	number	Round down
`Math.ceil()`	number	Round up
`Math.trunc()`	number	Drop decimals

Get the PDF Guide

This article is also available as a clean 8-page PDF with a full cheatsheet page — useful to keep open while you code.

Download the JavaScript Number Formatting PDF Guide

Covers everything in this article plus a printable cheatsheet with every method, example, and output on one page.

How st-core.fscss Multi-Line Charts Work

FSCSS — Mon, 13 Apr 2026 23:22:54 +0000

Most chart libraries solve the same problem with the same tools: Canvas, SVG, a JavaScript runtime, and a bundle that adds weight to every page that loads it.

st-core.fscss takes a different approach. No SVG. No Canvas. No runtime rendering. Just CSS doing the work it was always capable of doing.

The Core Idea

st-core.fscss uses three browser-native features to render charts:

clip-path: polygon() to draw the chart shape
CSS custom properties (--st-p1 through --st-p8) to store data points
FSCSS mixins to generate the chart structure at compile time

The flow is straightforward:

data → CSS variables → clip-path → visual chart

Once compiled, your stylesheet contains only what your charts need. No runtime overhead. No extra depth added to your HTML. If you use the CDN, you are loading a small FSCSS loader and nothing else.

Multi-Line Charts

The multi-line chart is a good example of how the architecture stays clean even as complexity grows.

The key concept is one renderer, multiple datasets. You define a single @st-chart-line renderer and let each line element carry its own data via scoped CSS variables.

<script src="https://cdn.jsdelivr.net/npm/fscss@1.1.24/exec.min.js" async></script>

<style>
@import((*) from st-core)

@st-root()

.chart {
  height: 200px;
  position: relative;
  @st-chart-points(20, 25, 21, 37, 30, 60, 27, 50)
}

@st-chart-line(.chart-line)

.chart-line {
  background: currentColor;
  @st-chart-line-width(2px);
}

.line-1 { color: #32D8D4; }

.line-2 {
  color: #E8A030;
  @st-chart-points(10, 20, 16, 15, 66, 50, 80, 54)
}

.line-3 {
  color: #B840C8;
  @st-chart-points(5, 39, 20, 30, 27, 70, 60, 70)
}

@st-chart-grid(.chart-grid, 10, 7)
@st-chart-axis-y(.y-axis)
@st-chart-axis-x(.x-axis)
</style>

<div class="chart">
  <div class="chart-line line-1"></div>
  <div class="chart-line line-2"></div>
  <div class="chart-line line-3"></div>
  <div class="chart-grid"></div>
  <div class="y-axis">
    <span>0</span><span>20</span><span>40</span>
    <span>60</span><span>80</span><span>100</span>
  </div>
</div>

<div class="x-axis">
  <span>Sun</span><span>Mon</span><span>Tue</span>
  <span>Wed</span><span>Thu</span><span>Fri</span><span>Sat</span>
</div>

Each line element overrides its own dataset independently. The renderer reads whichever --st-p* variables are scoped to that element. The result is composable and predictable.

Available Mixins

Mixin	Output
`@st-chart-line`	Line renderer
`@st-chart-fill`	Area chart fill
`@st-chart-dot`	Data point markers
`@st-chart-grid`	Background grid
`@st-chart-axis-x` / `@st-chart-axis-y`	Axis label layout

All generated at compile time.

Real-Time Updates

For dynamic data, you can update chart variables directly from JavaScript:

chart.style.cssText = `
  --st-p1: 40%;
  --st-p2: 75%;
  --st-p3: 60%;
`;

JavaScript passes the values. CSS handles the rendering. Animations work automatically if you have a transition defined.

Why It Works This Way

No heavy dependencies to install or maintain. The browser's own rendering pipeline does the visual work, so performance stays native. Your data lives in CSS as plain custom properties, not inside a configuration object or a framework component. And because you write the styles yourself, nothing about the chart's appearance is locked into a preset.

Live Demo

fscss-ttr.github.io/st-core.fscss/multi-chart

st-core.fscss is a new and actively maintained open source project. If the approach interests you, contributions are welcome. Explore the repo on GitHub and try building your own chart system.

FSCSS Loop: Styling 36 Elements Without Writing 36 Rules

FSCSS — Fri, 10 Apr 2026 22:12:50 +0000

In regular CSS, styling multiple elements individually means writing a rule for each one. nth-child(1), nth-child(2)... all the way down. That's repetitive, brittle, and just not fun.

FSCSS solves this with arrays and loops — no mixins needed.

The Demo

36 dots. 36 different colors. One loop.

How It Works

Step 1 — generate values with count()

@arr i[count(36, 10)]

count(36, 10) generates 36 values starting from 10, incrementing by 10 each time:
10, 20, 30, 40 ... 360

⚠️ Note: the sequence starts at 10, not 0. count(n, step) begins at step, not zero.

Step 2 — loop with @arr.name[]

.orbit .dot:nth-child(@arr.i[]) {
  $i: @arr.i[];

  background: hsl($i, 100%, 60%);
  transform: rotate($i!deg) translateX(120px);
  %2(width, height[: 50px;])
  position: absolute;
}

@arr.i[] inside a selector expands into every nth-child index — starting from 1, matching CSS's own 1-based nth-child counting. Each iteration binds the current value to $i, which gets used for both the hue and the rotation angle.

So dot #1 gets hsl(10, 100%, 60%) rotated 10deg. Dot #2 gets hsl(20, 100%, 60%) rotated 20deg. All the way to 360deg — a full rainbow orbit.

What this replaces

Without FSCSS, you'd write something like:

.orbit .dot:nth-child(1)  { background: hsl(10,  100%, 60%); transform: rotate(10deg)  translateX(120px); }
.orbit .dot:nth-child(2)  { background: hsl(20,  100%, 60%); transform: rotate(20deg)  translateX(120px); }
/* ... 34 more lines */
.orbit .dot:nth-child(36) { background: hsl(360, 100%, 60%); transform: rotate(360deg) translateX(120px); }

That's 36 rules written by hand — and if you want to change the radius, you touch 36 lines.

With FSCSS, it's one block. Change 120px once, done.

Key things to know

count(n, step) starts at step, not 0. count(36, 10) → 10, 20, 30 ... 360
@arr.name[] in a selector loops the whole rule block per value
@arr.name[] in a value outputs the current iteration's value
nth-child indexing is 1-based in both CSS and FSCSS arrays — they align naturally
For testing No build step — use FSCSS runtime via jsdelivr

<script src="https://cdn.jsdelivr.net/npm/fscss@1.1.24/exec.min.js" async></script>

Docs

Array reference → fscss.devtem.org/arrays

Did you know st-core.fscss doesn't need a runtime in production?

FSCSS — Wed, 08 Apr 2026 22:29:31 +0000

The <script> tag for FSCSS is a browser compiler- great for development, but optional for production.

You can compile your .fscss file down to plain .css ahead of time. The browser gets standard CSS. No runtime. No wait.

Compile with the CLI

npm install -g fscss
fscss style.fscss style.css

That's it. style.css is now pure clip-path math and CSS variables — no FSCSS runtime needed.

Prefer a GUI? There's a VS Code extension

FSCSS for VS Code gives you:

Syntax highlighting for .fscss files
Autocomplete + snippets
Auto Compile on Save — outputs to filename.fscss.css automatically
Command Palette: FSCSS: Compile

Why bother compiling?

	Dev (runtime)	Prod (compiled)
Setup	Drop in a `<script>` tag	One CLI command
Performance	JS parses before render	Instant CSS render
JS disabled	Chart won't show	Chart still works
Bundle size	Runtime included	Zero runtime cost

Repo → github.com/fscss-ttr/st-core.fscss ⭐ MIT

Building a Data-Driven Chart UI with Zero JavaScript (Pure CSS + FSCSS)

FSCSS — Wed, 01 Apr 2026 23:35:28 +0000

Most modern web charts rely on heavy JavaScript libraries. While powerful, they often come with a performance cost and complex integration steps.
What if you could build a fully styled, data-driven chart UI using Pure CSS?
By using FSCSS and its utility system, st-core (statistic core)_, we can transform raw data into visual interfaces directly within our stylesheets.

1. The Setup

First, include the FSCSS runtime and import the st-core helpers.

<script src="https://cdn.jsdelivr.net/npm/fscss@1.1.24/exec.min.js" async></script> 

<style>
@import((*) from st-core) 

/* Initialize design tokens, layout base, and colors */
@st-root() 
@st-container(body) 
</style>

2. Attaching the Components

st-core.fscss uses directive-like helpers to generate the complex logic needed for backgrounds, lines, and markers.

@st-chart-fill(.chart-fill)    /* Area under the line */
@st-chart-line(.chart-line)    /* The actual trend line */
@st-chart-dot(.chart-dot, 70, 60) /* Data point marker at x=70, y=60 */

3. Mapping Data to UI

This is where the magic happens. The @st-chart-points helper maps your numeric data points into CSS variables. These variables are then used to calculate a clip-path that draws the chart.

.chart {
  width: 300px;
  height: 400px;
  border-radius: 25px;
  border: 2px solid var(--st-accent);
  position: relative;
  overflow: hidden;
  background: var(--st-surface);

  /* The Data: These points define the shape of the graph */
  @st-chart-points(20, 25, 21, 37, 30, 60, 27, 50)
}

4. Customizing the Visuals

Because this is CSS, customization is trivial. You can use filters, transitions, and standard properties to polish the UI.

/* Add a glow to the line */
.chart-line {
  @st-chart-line-width(2px);
  filter: drop-shadow(0 0 8px var(--st-accent));
}

/* Style the tooltip and point */
.chart-dot {
  position: relative;
  --st-accent: #c4a8ff; /* Local theme override */
}

.chart-dot:after {
  content: attr(data-point); /* Pulls data from HTML attribute */
  background: var(--st-accent);
  padding: 6px 8px;
  border-radius: var(--st-radius-sm);
  /* ... positioning ... */
}

5. The Final HTML Structure

The HTML remains incredibly clean. No Canvas elements, no complex SVG strings—just a few semantic divs.

<div class="chart">
  <div class="chart-fill"></div>
  <div class="chart-line"></div>
  <div class="chart-dot" data-point="$405.67"></div>
</div>

Why This Matters

Zero JS Overhead: The browser handles the rendering logic via CSS variables and clip-paths.
Declarative Data: You define data where you define your styles.
Fully Themeable: Since it uses CSS variables (--st-accent, etc.), switching to dark mode or changing brand colors is instantaneous. This approach shifts the paradigm: CSS isn't just styling the UI, it’s generating the UI from data.

Check out the project here: st-core on GitHub

FSCSS Toast System (Dynamic UI Without Repetition)

FSCSS — Sun, 22 Mar 2026 17:39:25 +0000

A clean, scalable toast/notification system built with FSCSS using events + arrays + dynamic selectors.

No repeated classes. No manual variants.
Just structured, reusable styling.

Features

Dynamic toast types (success, error, warning, info)
Centralized color logic using @event
Auto-generated class variants with @arr
Clean and scalable structure
Modern UI styling (glass + soft colors)

Define Toast Color Logic

@event toast-color(type){

if type:success{
  return: #38d9a9;
}

el-if type:error{
  return: #ff6b6b;
}

el-if type:warning{
  return: #f7b267;
}

el{
  return: #74c0fc;
}

}

This acts like a function:

type → color

Base Toast Component

.toast{
  padding: 12px 16px;
  border-radius: 10px;
  color: #fff;
  font-size: 14px;

  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(8px);

  border-left: 4px solid currentColor;

  display: flex;
  gap: 10px;
  align-items: center;

  min-width: 220px;
}

Generate Toast Variants

@arr toast-types[success,error,warning,info]
@arr i[1,2,3,4]

.toast-@arr.toast-types[@arr.i[]]{

  $type: @arr.toast-types[@arr.i[]];

  color: @event.toast-color($type);
}

💡 Why the Index Mapping?

FSCSS currently resolves:

Selector → index ("1, 2, 3...")
Value → actual array value ("success, error...")

So we map them together:

index → value → selector

Result:

.toast-success { color: ... }
.toast-error { color: ... }

Usage

<div class="toast toast-success">Operation successful</div>

<div class="toast toast-error">Something went wrong</div>

<div class="toast toast-warning">Check your input</div>

<div class="toast toast-info">New update available</div>

✨ Optional: Add Icons

<div class="toast toast-success">✔ Operation successful</div>
<div class="toast toast-error">✖ Something went wrong</div>
<div class="toast toast-warning">⚠ Check your input</div>
<div class="toast toast-info">ℹ New update available</div>

🔥 How It Works

Flow:

Class → Array Mapping → Event Logic → Final Style

Example:

toast-success
→ mapped to "success"
→ passed into @event
→ returns color
→ applied to UI

Why This Pattern Matters

Avoids repetitive CSS
Centralizes UI logic
Scales easily as types grow
Keeps styling consistent

Takeaway

This approach shows how FSCSS can:

Handle UI state
Generate variants automatically
Apply logic inside styling

Without relying on JavaScript.

Next Ideas

Add animations (slide-in, fade)
Create stacked notifications (top-right)
Build theme variations (dark/light)
Auto-inject icons via "@event"

Clean. Scalable. Powerful.

Welcome to structured CSS ❤️

FSCSS tutorial Follow

Figured Shorthand Cascading Style Sheet

⚡ Creating Custom Functions in FSCSS (Yes, CSS Can Do This)

FSCSS — Fri, 20 Mar 2026 16:24:13 +0000

One thing about FSCSS is that you can define your own functions… inside your styles. Here’s a simple example of how that works. 👇

Custom randint Function

@define randint(array){
@random(@use(array)) 
}

What this function does:

Takes an array as an argument.
Returns a random value directly from that array.

Step 1: Defining Arrays
First, we set up our possible values:

@arr sizes[ 100px, 150px, 200px ]

Step 2: Using the Function
We call our custom function and assign it to a variable:

$height: @randint(@arr.sizes);

Now $height dynamically becomes either 100px, 150px, or 200px (randomly selected at compile).

Why This Is Interesting

Reusable Logic: You can create complex logic once and use it across your entire design system.
Dynamic Design Systems: Build layouts that feel organic and varied rather than static and repetitive.

Example Usage

Applying that logic to a class is straightforward:

.box { 
  height: $height; 
  width: $height; 
  background: #2c5364; 
}

Every compile can produce a slightly different UI!

https://www.npmjs.com/package/fscss

FSCSS Import System You Actually Wanted

FSCSS — Tue, 10 Mar 2026 15:09:22 +0000

FSCSS v1.1.16+: Import System

JavaScript-Style Imports

@import((
flex-center,
flex-wrap, 
flex-x
) from flex-control)
@import((
circle-progress as clp,
progress-range as pr,
progress-root as p-root
) from circle-progress)
@import((*) from st-core)

@p-root() 
@clp(.progress)
.p-72{
  @pr(72) 
}
.container {
  @flex-center()
}

Named imports. Aliases.

5 Ways to Import

Named imports

@import((flex-x, flex-center) from flex-control)

Aliases (when names clash)

@import((circle-progress as cp) from circle-progress)

Everything (when you're lazy)

@import((*) from themes)

Remote (CDN friendly)

@import((btn) from "https://cdn.example/buttons.fscss")

Built-in libs (no quotes needed)

@import((*) from icon-mask)

Also: It's Faster Now

v1.1.16+ CDN loads quicker than older versions.

The Error Messages Actually Make Sense

@import((* as all) from "style.fscss")
// Warning: syntax error at @import((* as all) from "style.fscss"): unexpected *

No more cryptic parser errors at 2am.

Same modular architecture. Way less noise.

👉 https://github.com/fscss-ttr/fscss-modules/

how it feels when simple code yields impressive results?

FSCSS — Thu, 26 Feb 2026 23:04:46 +0000

You ever write something small…

Almost too simple…
Then you refresh the browser and just stare at it like
“Wait… I built this?” 😅

That’s the feeling.

Today I was playing with FSCSS and its simple plugin system, nothing complex, nothing heavy, just clean structure and small utilities working together.

And somehow…
It turns into a clean, responsive landing page.
No bloated configs.
Just focused structure.

FSCSS plugs → simple syntax → real UI.

Here’s a small example landing page built using FSCSS:

Version: 1.1.13
It’s simple.

But sometimes simple becomes powerful when it’s reusable.

That’s what I love about building tools.
You don’t always need 10,000 lines of code to create impact.

Sometimes you just need the right abstraction.
FSCSS keeps evolving, small, practical, useful.

And honestly?

Create Dynamic Shapes with FSCSS: A Quick Guide for Devs

FSCSS — Sat, 06 Sep 2025 10:37:38 +0000

Create Dynamic Shapes with FSCSS

If you’re looking to add some flair to your web projects, this FSCSS-powered shape generator is a lightweight way to create dynamic, colorful shapes with minimal code. Let’s dive into how it works and why it’s a neat tool for developers.

🔹 The Code

Here’s the complete snippet to generate 10 unique shapes with FSCSS:

<!-- Container for shapes -->
<section class="shapes" id="shapes"></section>

<style>
  /* Import FSCSS initialization and themes */
  @import(exec(_init themes))

  /* Define arrays for shapes and colors */
  @arr list[cross, star, diamond, cloud, teardrop, triangle, hexagon, trapeziod, crescent, arrow, square]
  @arr colors[red, blue, green, orange, purple, pink, brown, teal, gold, violet, gray]

  /* Style shapes using arrays */
  .shape:nth-child(@arr.list[]){
    %2(width, height [: 100px;])
    clip-path: @event.shape(@arr.list[]);
  }
  .shape:nth-child(@arr.colors[]){
    background: @arr.colors[];
    display: inline-block;
  }
</style>

<script>
  // Dynamically generate 10 shape divs
  const shapeContainer = document.getElementById("shapes");
  for (let i = 0; i < 10; i++) {
    const shape = document.createElement("div");
    shape.className = "shape";
    shapeContainer.appendChild(shape);
  }
</script>

<!-- FSCSS CDN -->
<script src="https://cdn.jsdelivr.net/npm/fscss@1.1.6" async></script>

🚀 Why It’s Cool

FSCSS Magic

→ The @arr and @event directives let you loop through shapes and colors effortlessly, reducing repetitive CSS.

Dynamic & Scalable

→ The JavaScript loop creates

s on the fly, and FSCSS applies unique shapes and colors based on array indices.

Lightweight

→ Minimal code for a visually engaging result, perfect for prototypes or creative UI elements.

⚙️ How It Works

HTML → A simple acts as the container for dynamically generated shapes.
FSCSS → Uses arrays (list for shapes, colors for backgrounds) and the @event.shape function imported to apply clip-path styles dynamically.
JavaScript → Creates 10
elements with the shape class, appended to the container.
Styling → Each shape gets a unique clip-path and color, displayed inline for a grid-like effect.

🎨 Try It Out

Drop this code into your HTML, ensure the FSCSS library is loaded, and watch colorful shapes come to life!

It’s great for:

UI experiments
Loading animations
Interactive backgrounds

📚 Learn More

Check out the FSCSS for more on @arr, @event and much more.
Share your tweaks or use cases in the comments! 🚀

Ditch the Repetition! Introducing @arr for Smart CSS with FSCSS

FSCSS — Thu, 31 Jul 2025 19:51:02 +0000

Hey everyone! 👋 Ever find yourself writing the same CSS properties over and over for different elements? Or manually creating nth-child rules for a series of items? There's a smarter way!

I wanted to share a super-handy feature from FSCSS that's a game-changer for writing clean, efficient styles: the @arr array declaration.

What is `@arr`?

It's a simple, powerful way to declare and reuse lists of values directly in your CSS. Think of it as a variable for a series of values—perfect for colors, spacings, font stacks, or any repeatable pattern.

🔧 The Basic Syntax
Declaring an array is as simple as:

@arr(arrayName[value1, value2, value3,...])

You can then use it in some ways:

@arr.arrayName[]: Iterates through the values, perfect for applying a different value to each element in a sequence.
@arr.arrayName(separator): Expands all values at once, great for creating a single string like a font stack or a list of properties.
@rr.arrayName[index], 1-Indexed: Access begins from index [1], not [0].FSCSS arrays are 1-indexed Accessing out-of-bound indexes returns undefined

Let's dive into some examples to see how this works in practice.

🎨 Example 1: Sequential Styling
Imagine you have a list and want to give each item a different color without writing a separate rule for each one.

Before @arr:

ul li:nth-child(1) {
  color: red;
}
ul li:nth-child(2) {
  color: green;
}
ul li:nth-child(3) {
  color: blue;
}

With @arr:
First, declare your color array:

@arr(colors[red, green, blue])

Then, use the [] syntax to iterate through it with your selector:

ul li:nth-child(@arr.colors[]) {
  background-color: @arr.colors[];
}

Result:

The first li gets background-color: red;
The second gets background-color: green;
The third gets background-color: blue;

So clean! ✨

🖋️ Example 2: Creating a Font Stack
This is perfect for consolidating fallback fonts into a single, reusable variable.

Declare your font array:

@arr(fonts[Arial, 'Helvetica Neue', sans-serif])

Then, use the () syntax to expand all values into a single property:

body {
  font-family: @arr.fonts(,);
}

Result:

font-family: Arial, 'Helvetica Neue', sans-serif;

No more re-typing that long list of fonts!

📏 Example 3: Dynamic CSS with Prefixes
You can even add custom prefixes and suffixes when you expand an array, which is great for generating dynamic properties.

Declare a margins array:

@arr(margins[10px, 20px, 30px])

Use the () syntax with a custom prefix margin::

div {
  content: "margin: @arr.margins(;margin: );";
}

Result:

content: "margin: 10px; margin: 20px; margin: 30px;";

This is a powerful pattern for generating responsive units or dynamic classes.

✨ Why This Matters

DRY (Don't Repeat Yourself): Define your values once and reuse them everywhere.
Maintainability: Need to change a color or a font? Update the array declaration, and it's changed everywhere.
Readability: Your CSS becomes much cleaner and easier to understand.
Automation: @arr handles the repetition for you, saving you time and effort.

If you're using FSCSS, give @arr a try—it'll simplify your workflow and make your stylesheets much smarter.

learn more about FSCSS

What are your favorite ways to use arrays in your CSS