22 Tailwind CSS Countdown Timers
02 / 22

All 22 in 22 Tailwind CSS Countdown Timers

  1. 01Accessible Tailwind CSS Countdown Timer with ARIA Live Region
  2. 02Pure Tailwind CSS Countdown Timer Without JavaScript
  3. 03Tailwind Session Timeout Warning Modal with Countdown
  4. 04Tailwind Circular Countdown Timer with SVG Progress Ring
  5. 05Tailwind OTP Input with Resend Code Countdown Timer
  6. 06Tailwind Rate Limit Button with Retry-After Countdown
  7. 07Tailwind Auction Countdown Timer with Anti-Snipe Extension
  8. 08Tailwind Delivery ETA Countdown with Order Tracking Steps
  9. 09Tailwind Waitlist Landing Page with Launch Countdown
  10. 10Tailwind Webinar Countdown Timer with Time Zone Display
  11. 11Tailwind Appointment Reminder Card with Countdown
  12. 12Tailwind Exam Timer with Time Remaining Warnings
  13. 13Tailwind Free Trial Countdown Banner for SaaS Apps
  14. 14Tailwind Scheduled Maintenance Countdown Status Page
  15. 15Tailwind Virtual Waiting Room Queue Countdown
  16. 16Tailwind Daily Streak Countdown Widget for Habit Apps
  17. 17Tailwind Flash Sale Countdown Timer for Product Pages
  18. 18Tailwind Sticky Announcement Bar with Countdown Timer
  19. 19Tailwind Shopping Cart Reservation Countdown Timer
  20. 20Tailwind Coming Soon Page with Launch Countdown Timer
  21. 21Tailwind Interval Workout Timer with Circular Progress
  22. 22Tailwind Retro Flip Clock Countdown Timer
Pure TailwindMIT licensed

Pure Tailwind CSS Countdown Timer Without JavaScript

A twenty-minute exam clock with zero JavaScript: four registered @property integers step down on keyframes, and CSS counters print them. Tailwind holds the counters as arbitrary properties ([counter-reset:tcd02mt_var(--tcd02-mt)] + before:content-[counter(tcd02mt)]), the keyframes live in @theme, and a new depleting bar shows the whole window at a glance.

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The code

<section class="tcd-02 w-full min-h-svh grid place-items-center bg-tcd02-page bg-[radial-gradient(80%_60%_at_50%_42%,var(--color-tcd02-glow),transparent_70%)] px-5 py-14 font-tcd02-mono text-tcd02-ink" aria-labelledby="tcd-02-title">
  <div class="grid w-full max-w-[760px] justify-items-center gap-6">
    <header class="min-w-0 text-center">
      <span class="mb-3.5 inline-flex items-center gap-2 rounded-full border border-tcd02-acc/40 bg-tcd02-acc/10 px-3 py-1.5 text-[10.5px] uppercase tracking-[0.2em] text-tcd02-acc"><span aria-hidden="true" class="size-1.5 rounded-full bg-tcd02-acc animate-tcd02-blink motion-reduce:animate-none"></span>zero javascript</span>
      <h2 id="tcd-02-title" class="mb-2 text-[clamp(19px,3.4vw,26px)] font-medium leading-tight tracking-[-0.01em] text-balance">Practice set — Basalt certification</h2>
      <p class="mx-auto max-w-[52ch] text-[13px] leading-relaxed text-tcd02-mut text-pretty"><time datetime="PT20M">Twenty minutes</time> from the moment this page rendered. The clock below is animated CSS, not a script.</p>
    </header>

    <div role="timer" aria-label="Twenty minute practice timer, counting down from page load" class="relative w-full overflow-hidden rounded-2xl border border-tcd02-rule bg-tcd02-panel px-[clamp(14px,4vw,32px)] pt-[clamp(28px,6vw,48px)] pb-7 text-center shadow-[inset_0_0_90px_rgb(0_0_0/0.55),0_30px_60px_-30px_rgb(0_0_0/0.8)] after:pointer-events-none after:absolute after:inset-0 after:bg-[repeating-linear-gradient(to_bottom,rgb(255_255_255/0.045)_0_1px,transparent_1px_3px)] after:content-[''] motion-reduce:after:hidden">
      <div aria-hidden="true" class="flex items-baseline justify-center gap-0.5 tabular-nums text-tcd02-acc [text-shadow:0_0_26px_var(--color-tcd02-acc-glow)]">
        <em class="text-[clamp(52px,17vw,116px)] font-medium not-italic leading-[0.9] tracking-[-0.04em] animate-tcd02-mt [counter-reset:tcd02mt_var(--tcd02-mt)] before:content-[counter(tcd02mt)]"></em>
        <em class="text-[clamp(52px,17vw,116px)] font-medium not-italic leading-[0.9] tracking-[-0.04em] animate-tcd02-mu [counter-reset:tcd02mu_var(--tcd02-mu)] before:content-[counter(tcd02mu)]"></em>
        <span class="text-[clamp(40px,12vw,88px)] leading-[0.9] animate-tcd02-blink motion-reduce:animate-none motion-reduce:opacity-50">:</span>
        <em class="text-[clamp(52px,17vw,116px)] font-medium not-italic leading-[0.9] tracking-[-0.04em] animate-tcd02-st [counter-reset:tcd02st_var(--tcd02-st)] before:content-[counter(tcd02st)]"></em>
        <em class="text-[clamp(52px,17vw,116px)] font-medium not-italic leading-[0.9] tracking-[-0.04em] animate-tcd02-su [counter-reset:tcd02su_var(--tcd02-su)] before:content-[counter(tcd02su)]"></em>
      </div>
      <p class="mt-4 text-[10.5px] uppercase tracking-[0.22em] text-tcd02-mut">minutes · seconds remaining</p>
      <div aria-hidden="true" class="mx-auto mt-6 h-1 max-w-[420px] overflow-hidden rounded-full bg-tcd02-rule">
        <span class="block h-full origin-left rounded-full bg-tcd02-acc shadow-[0_0_12px_var(--color-tcd02-acc-glow)] animate-tcd02-bar"></span>
      </div>
      <div role="status" class="invisible absolute inset-0 z-10 grid place-content-center gap-1.5 bg-tcd02-panel opacity-0 animate-tcd02-over">
        <strong class="text-[clamp(26px,7vw,44px)] font-medium tracking-[-0.02em] text-tcd02-acc">Time up</strong>
        <span class="text-xs text-tcd02-mut">Answers submitted automatically</span>
      </div>
    </div>

    <p class="flex min-w-0 items-start gap-2.5 rounded-xl border border-dashed border-tcd02-rule px-4 py-3.5 text-[12.5px] leading-relaxed text-tcd02-mut text-pretty">
      <svg viewBox="0 0 16 16" width="15" height="15" aria-hidden="true" class="mt-0.5 flex-none text-tcd02-acc"><path d="M8 1.6 1.2 13.4h13.6L8 1.6Z" fill="none" stroke="currentColor" stroke-width="1.3"/><path d="M8 6v3.4M8 11.2v.9" stroke="currentColor" stroke-width="1.3"/></svg>
      <span>A CSS-only countdown measures a duration from render, not the distance to a timestamp. It fits session and quiz clocks. For "sale ends Friday" you need the real clock, which means script.</span>
    </p>
  </div>
</section>
@import "tailwindcss";
/* Registered integers: the one thing utilities cannot declare. */

@property --tcd02-mt {
  syntax: '<integer>';
  inherits: false;
  initial-value: 1;
}

@property --tcd02-mu {
  syntax: '<integer>';
  inherits: false;
  initial-value: 9;
}

@property --tcd02-st {
  syntax: '<integer>';
  inherits: false;
  initial-value: 5;
}

@property --tcd02-su {
  syntax: '<integer>';
  inherits: false;
  initial-value: 9;
}

@theme {
  --color-tcd02-page: #05070a;
  --color-tcd02-page: oklch(0.14 0.02 190);
  --color-tcd02-glow: #0c1a16;
  --color-tcd02-glow: oklch(0.21 0.04 170);
  --color-tcd02-panel: #0a0f14;
  --color-tcd02-panel: oklch(0.19 0.025 185);
  --color-tcd02-ink: #d8fff0;
  --color-tcd02-ink: oklch(0.94 0.07 165);
  --color-tcd02-mut: #7fa598;
  --color-tcd02-mut: oklch(0.7 0.05 168);
  --color-tcd02-rule: #1d2b26;
  --color-tcd02-rule: oklch(0.28 0.03 180);
  --color-tcd02-acc: #37e58f;
  --color-tcd02-acc: oklch(0.8 0.18 155);
  --color-tcd02-acc-glow: rgb(55 229 143 / 0.38);
  --font-tcd02-mono: 'JetBrains Mono', ui-monospace, monospace;
  --animate-tcd02-mt: tcd02-mt 1200s steps(2, end) forwards;
  --animate-tcd02-mu: tcd02-mu 600s steps(10, end) 2;
  --animate-tcd02-st: tcd02-st 60s steps(6, end) infinite;
  --animate-tcd02-su: tcd02-su 10s steps(10, end) infinite;
  --animate-tcd02-bar: tcd02-bar 1200s linear forwards;
  --animate-tcd02-over: tcd02-over 0.01s linear 1200s forwards;
  --animate-tcd02-blink: tcd02-blink 2s steps(2, end) infinite;

  @keyframes tcd02-mt {
    from {
      --tcd02-mt: 1;
    }

    to {
      --tcd02-mt: -1;
    }
  }

  @keyframes tcd02-mu {
    from {
      --tcd02-mu: 9;
    }

    to {
      --tcd02-mu: -1;
    }
  }

  @keyframes tcd02-st {
    from {
      --tcd02-st: 5;
    }

    to {
      --tcd02-st: -1;
    }
  }

  @keyframes tcd02-su {
    from {
      --tcd02-su: 9;
    }

    to {
      --tcd02-su: -1;
    }
  }

  @keyframes tcd02-bar {
    from {
      transform: scaleX(1);
    }

    to {
      transform: scaleX(0);
    }
  }

  @keyframes tcd02-over {
    to {
      opacity: 1;
      visibility: visible;
    }
  }

  @keyframes tcd02-blink {
    0%,
        50% {
      opacity: 0.55;
    }

    51%,
        100% {
      opacity: 0.15;
    }
  }
}

.tcd-02 {
  width: 100%;
  min-height: 100svh;
}

Setup — do this once per project

Skip this if your project already runs Tailwind v4.

1Load Tailwind
<script src="https://cdn.jsdelivr.net/npm/@tailwindcss/browser@4"></script>

Compiles in the browser — perfect for a CodePen or a quick test, not for production.

2Add the stylesheetRequiredthe @theme block is what makes the custom utilities exist
@import "tailwindcss";
/* Registered integers: the one thing utilities cannot declare. */

@property --tcd02-mt {
  syntax: '<integer>';
  inherits: false;
  initial-value: 1;
}

@property --tcd02-mu {
  syntax: '<integer>';
  inherits: false;
  initial-value: 9;
}

@property --tcd02-st {
  syntax: '<integer>';
  inherits: false;
  initial-value: 5;
}

@property --tcd02-su {
  syntax: '<integer>';
  inherits: false;
  initial-value: 9;
}

@theme {
  --color-tcd02-page: #05070a;
  --color-tcd02-page: oklch(0.14 0.02 190);
  --color-tcd02-glow: #0c1a16;
  --color-tcd02-glow: oklch(0.21 0.04 170);
  --color-tcd02-panel: #0a0f14;
  --color-tcd02-panel: oklch(0.19 0.025 185);
  --color-tcd02-ink: #d8fff0;
  --color-tcd02-ink: oklch(0.94 0.07 165);
  --color-tcd02-mut: #7fa598;
  --color-tcd02-mut: oklch(0.7 0.05 168);
  --color-tcd02-rule: #1d2b26;
  --color-tcd02-rule: oklch(0.28 0.03 180);
  --color-tcd02-acc: #37e58f;
  --color-tcd02-acc: oklch(0.8 0.18 155);
  --color-tcd02-acc-glow: rgb(55 229 143 / 0.38);
  --font-tcd02-mono: 'JetBrains Mono', ui-monospace, monospace;
  --animate-tcd02-mt: tcd02-mt 1200s steps(2, end) forwards;
  --animate-tcd02-mu: tcd02-mu 600s steps(10, end) 2;
  --animate-tcd02-st: tcd02-st 60s steps(6, end) infinite;
  --animate-tcd02-su: tcd02-su 10s steps(10, end) infinite;
  --animate-tcd02-bar: tcd02-bar 1200s linear forwards;
  --animate-tcd02-over: tcd02-over 0.01s linear 1200s forwards;
  --animate-tcd02-blink: tcd02-blink 2s steps(2, end) infinite;

  @keyframes tcd02-mt {
    from {
      --tcd02-mt: 1;
    }

    to {
      --tcd02-mt: -1;
    }
  }

  @keyframes tcd02-mu {
    from {
      --tcd02-mu: 9;
    }

    to {
      --tcd02-mu: -1;
    }
  }

  @keyframes tcd02-st {
    from {
      --tcd02-st: 5;
    }

    to {
      --tcd02-st: -1;
    }
  }

  @keyframes tcd02-su {
    from {
      --tcd02-su: 9;
    }

    to {
      --tcd02-su: -1;
    }
  }

  @keyframes tcd02-bar {
    from {
      transform: scaleX(1);
    }

    to {
      transform: scaleX(0);
    }
  }

  @keyframes tcd02-over {
    to {
      opacity: 1;
      visibility: visible;
    }
  }

  @keyframes tcd02-blink {
    0%,
        50% {
      opacity: 0.55;
    }

    51%,
        100% {
      opacity: 0.15;
    }
  }
}

.tcd-02 {
  width: 100%;
  min-height: 100svh;
}
3Fonts used by this demooptional — skip if you have your own type stack
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&display=swap">

What changed in the port

Which parts became utilities, which stayed CSS, and why.

  • The four @property registrations are the only CSS left besides tokens; every keyframe moved into @theme behind an --animate-* token.
  • Bug fix from the CSS original: the counter was reset inside ::before, which never sees a non-inheriting registered property. The reset now lives on the element ([counter-reset:…]) and only content sits on the pseudo.
  • UI upgrade: a depleting phosphor bar (animate-tcd02-bar, a compositor-only scaleX) shows the whole window at a glance, and the badge gained a blinking status dot.
  • UI upgrade: muted copy rose from 0.62 to 0.70 lightness (now 6:1 on the panel) and the face got an inset vignette plus a soft drop shadow.
Paste this into ChatGPT, Claude, Cursor, or any coding assistant. The block below is pre-framed with everything the AI needs to integrate this demo into your project — markup, styles, scoping notes, and the source URL. Hit Copy and paste straight into your chat.
Here's a working CSS demo from CodeFronts. Use it as-is or adapt to your framework. All classes are scoped under a unique prefix so the code won't collide with your existing styles. MIT licensed.
Demo: Pure Tailwind CSS Countdown Timer Without JavaScript
Source: https://codefronts.com/snippets/tailwind-css-countdown-timers/pure-tailwind-css-countdown-timer-without-javascript/

A twenty-minute exam clock with zero JavaScript: four registered @property integers step down on keyframes, and CSS counters print them. Tailwind holds the counters as arbitrary properties ([counter-reset:tcd02mt_var(--tcd02-mt)] + before:content-[counter(tcd02mt)]), the keyframes live in @theme, and a new depleting bar shows the whole window at a glance.
## HTML
```html
<section class="tcd-02 w-full min-h-svh grid place-items-center bg-tcd02-page bg-[radial-gradient(80%_60%_at_50%_42%,var(--color-tcd02-glow),transparent_70%)] px-5 py-14 font-tcd02-mono text-tcd02-ink" aria-labelledby="tcd-02-title">
  <div class="grid w-full max-w-[760px] justify-items-center gap-6">
    <header class="min-w-0 text-center">
      <span class="mb-3.5 inline-flex items-center gap-2 rounded-full border border-tcd02-acc/40 bg-tcd02-acc/10 px-3 py-1.5 text-[10.5px] uppercase tracking-[0.2em] text-tcd02-acc"><span aria-hidden="true" class="size-1.5 rounded-full bg-tcd02-acc animate-tcd02-blink motion-reduce:animate-none"></span>zero javascript</span>
      <h2 id="tcd-02-title" class="mb-2 text-[clamp(19px,3.4vw,26px)] font-medium leading-tight tracking-[-0.01em] text-balance">Practice set — Basalt certification</h2>
      <p class="mx-auto max-w-[52ch] text-[13px] leading-relaxed text-tcd02-mut text-pretty"><time datetime="PT20M">Twenty minutes</time> from the moment this page rendered. The clock below is animated CSS, not a script.</p>
    </header>

    <div role="timer" aria-label="Twenty minute practice timer, counting down from page load" class="relative w-full overflow-hidden rounded-2xl border border-tcd02-rule bg-tcd02-panel px-[clamp(14px,4vw,32px)] pt-[clamp(28px,6vw,48px)] pb-7 text-center shadow-[inset_0_0_90px_rgb(0_0_0/0.55),0_30px_60px_-30px_rgb(0_0_0/0.8)] after:pointer-events-none after:absolute after:inset-0 after:bg-[repeating-linear-gradient(to_bottom,rgb(255_255_255/0.045)_0_1px,transparent_1px_3px)] after:content-[''] motion-reduce:after:hidden">
      <div aria-hidden="true" class="flex items-baseline justify-center gap-0.5 tabular-nums text-tcd02-acc [text-shadow:0_0_26px_var(--color-tcd02-acc-glow)]">
        <em class="text-[clamp(52px,17vw,116px)] font-medium not-italic leading-[0.9] tracking-[-0.04em] animate-tcd02-mt [counter-reset:tcd02mt_var(--tcd02-mt)] before:content-[counter(tcd02mt)]"></em>
        <em class="text-[clamp(52px,17vw,116px)] font-medium not-italic leading-[0.9] tracking-[-0.04em] animate-tcd02-mu [counter-reset:tcd02mu_var(--tcd02-mu)] before:content-[counter(tcd02mu)]"></em>
        <span class="text-[clamp(40px,12vw,88px)] leading-[0.9] animate-tcd02-blink motion-reduce:animate-none motion-reduce:opacity-50">:</span>
        <em class="text-[clamp(52px,17vw,116px)] font-medium not-italic leading-[0.9] tracking-[-0.04em] animate-tcd02-st [counter-reset:tcd02st_var(--tcd02-st)] before:content-[counter(tcd02st)]"></em>
        <em class="text-[clamp(52px,17vw,116px)] font-medium not-italic leading-[0.9] tracking-[-0.04em] animate-tcd02-su [counter-reset:tcd02su_var(--tcd02-su)] before:content-[counter(tcd02su)]"></em>
      </div>
      <p class="mt-4 text-[10.5px] uppercase tracking-[0.22em] text-tcd02-mut">minutes · seconds remaining</p>
      <div aria-hidden="true" class="mx-auto mt-6 h-1 max-w-[420px] overflow-hidden rounded-full bg-tcd02-rule">
        <span class="block h-full origin-left rounded-full bg-tcd02-acc shadow-[0_0_12px_var(--color-tcd02-acc-glow)] animate-tcd02-bar"></span>
      </div>
      <div role="status" class="invisible absolute inset-0 z-10 grid place-content-center gap-1.5 bg-tcd02-panel opacity-0 animate-tcd02-over">
        <strong class="text-[clamp(26px,7vw,44px)] font-medium tracking-[-0.02em] text-tcd02-acc">Time up</strong>
        <span class="text-xs text-tcd02-mut">Answers submitted automatically</span>
      </div>
    </div>

    <p class="flex min-w-0 items-start gap-2.5 rounded-xl border border-dashed border-tcd02-rule px-4 py-3.5 text-[12.5px] leading-relaxed text-tcd02-mut text-pretty">
      <svg viewBox="0 0 16 16" width="15" height="15" aria-hidden="true" class="mt-0.5 flex-none text-tcd02-acc"><path d="M8 1.6 1.2 13.4h13.6L8 1.6Z" fill="none" stroke="currentColor" stroke-width="1.3"/><path d="M8 6v3.4M8 11.2v.9" stroke="currentColor" stroke-width="1.3"/></svg>
      <span>A CSS-only countdown measures a duration from render, not the distance to a timestamp. It fits session and quiz clocks. For "sale ends Friday" you need the real clock, which means script.</span>
    </p>
  </div>
</section>
```
## CSS
```css
@import "tailwindcss";
/* Registered integers: the one thing utilities cannot declare. */

@property --tcd02-mt {
  syntax: '<integer>';
  inherits: false;
  initial-value: 1;
}

@property --tcd02-mu {
  syntax: '<integer>';
  inherits: false;
  initial-value: 9;
}

@property --tcd02-st {
  syntax: '<integer>';
  inherits: false;
  initial-value: 5;
}

@property --tcd02-su {
  syntax: '<integer>';
  inherits: false;
  initial-value: 9;
}

@theme {
  --color-tcd02-page: #05070a;
  --color-tcd02-page: oklch(0.14 0.02 190);
  --color-tcd02-glow: #0c1a16;
  --color-tcd02-glow: oklch(0.21 0.04 170);
  --color-tcd02-panel: #0a0f14;
  --color-tcd02-panel: oklch(0.19 0.025 185);
  --color-tcd02-ink: #d8fff0;
  --color-tcd02-ink: oklch(0.94 0.07 165);
  --color-tcd02-mut: #7fa598;
  --color-tcd02-mut: oklch(0.7 0.05 168);
  --color-tcd02-rule: #1d2b26;
  --color-tcd02-rule: oklch(0.28 0.03 180);
  --color-tcd02-acc: #37e58f;
  --color-tcd02-acc: oklch(0.8 0.18 155);
  --color-tcd02-acc-glow: rgb(55 229 143 / 0.38);
  --font-tcd02-mono: 'JetBrains Mono', ui-monospace, monospace;
  --animate-tcd02-mt: tcd02-mt 1200s steps(2, end) forwards;
  --animate-tcd02-mu: tcd02-mu 600s steps(10, end) 2;
  --animate-tcd02-st: tcd02-st 60s steps(6, end) infinite;
  --animate-tcd02-su: tcd02-su 10s steps(10, end) infinite;
  --animate-tcd02-bar: tcd02-bar 1200s linear forwards;
  --animate-tcd02-over: tcd02-over 0.01s linear 1200s forwards;
  --animate-tcd02-blink: tcd02-blink 2s steps(2, end) infinite;

  @keyframes tcd02-mt {
    from {
      --tcd02-mt: 1;
    }

    to {
      --tcd02-mt: -1;
    }
  }

  @keyframes tcd02-mu {
    from {
      --tcd02-mu: 9;
    }

    to {
      --tcd02-mu: -1;
    }
  }

  @keyframes tcd02-st {
    from {
      --tcd02-st: 5;
    }

    to {
      --tcd02-st: -1;
    }
  }

  @keyframes tcd02-su {
    from {
      --tcd02-su: 9;
    }

    to {
      --tcd02-su: -1;
    }
  }

  @keyframes tcd02-bar {
    from {
      transform: scaleX(1);
    }

    to {
      transform: scaleX(0);
    }
  }

  @keyframes tcd02-over {
    to {
      opacity: 1;
      visibility: visible;
    }
  }

  @keyframes tcd02-blink {
    0%,
        50% {
      opacity: 0.55;
    }

    51%,
        100% {
      opacity: 0.15;
    }
  }
}

.tcd-02 {
  width: 100%;
  min-height: 100svh;
}
```

How this works

Integers that animate. A custom property registered as <integer> interpolates in whole numbers, so a keyframe from 9 to 0 with steps(10, end) lands on every digit once. Each digit is its own animation: units of seconds loop every 10s, tens every 60s, units of minutes every 600s, tens once over 1200s.

Counters print the number. CSS cannot put a custom property into content directly, but it can reset a counter to it:

<em class="animate-tcd02-su
  [counter-reset:tcd02su_var(--tcd02-su)]
  before:content-[counter(tcd02su)]"></em>

Why the reset sits on the element. The properties are registered with inherits: false, so a ::before never sees the animated value. Resetting the counter on the element and reading it in its pseudo-element keeps the value in scope.

The end state is a delay. The "Time up" panel runs a 10ms opacity/visibility animation delayed by 1200s with forwards, so it appears exactly when the digits reach 00:00.

Make it yours

  • Change the duration: edit every 1200s/600s in the @theme animate tokens and the starting initial-values.
  • Drop the scanlines by deleting the after: utilities on the face.
  • Retint the phosphor by editing --color-tcd02-acc; the glow is derived via --color-tcd02-acc-glow.
  • For hours, add a fifth @property and digit with its own animate token.

Gotchas — read before shipping

  • This measures a duration from render, not the distance to a timestamp — reload restarts it. Use demo 01's script for real deadlines.
  • Unregistered custom properties do not interpolate; without @property the digit jumps once at the end.
  • Underscores in arbitrary properties become spaces — [counter-reset:a_var(--x)] compiles to counter-reset: a var(--x).
  • Background tabs may pause CSS animations in some engines; the timer resumes but does not catch up.

Browser support

ChromeSafariFirefoxEdge
111+16.4+128+111+

Animated @property integers landed in Firefox 128, which matches Tailwind v4's own floor. Without it the digits show their initial values and the end panel still appears on time.

Techniques used in this demo

Plain CSSno Tailwind surface

@keyframestw ↗

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