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17 April 2025

<!doctype html>
<html lang="en">
<head>
  <title>Animated Stars Rating</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="/css/styles.css">
</head>
<body>
	<form class="rating">
		<div class="rating__stars">
			<input id="rating-1" class="rating__input rating__input-1" type="radio" name="rating" value="1">
			<input id="rating-2" class="rating__input rating__input-2" type="radio" name="rating" value="2">
			<input id="rating-3" class="rating__input rating__input-3" type="radio" name="rating" value="3">
			<input id="rating-4" class="rating__input rating__input-4" type="radio" name="rating" value="4">
			<input id="rating-5" class="rating__input rating__input-5" type="radio" name="rating" value="5">
			<label class="rating__label" for="rating-1">
				<svg class="rating__star" width="32" height="32" viewBox="0 0 32 32" aria-hidden="true">
					<g transform="translate(16,16)">
						<circle class="rating__star-ring" fill="none" stroke="#000" stroke-width="16" r="8" transform="scale(0)" />
					</g>
					<g stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
						<g transform="translate(16,16) rotate(180)">
							<polygon class="rating__star-stroke" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="none" />
							<polygon class="rating__star-fill" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="#000" />
						</g>
						<g transform="translate(16,16)" stroke-dasharray="12 12" stroke-dashoffset="12">
							<polyline class="rating__star-line" transform="rotate(0)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(72)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(144)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(216)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(288)" points="0 4,0 16" />
						</g>
					</g>
				</svg>
				<span class="rating__sr">1 star—Terrible</span>
			</label>
			<label class="rating__label" for="rating-2">
				<svg class="rating__star" width="32" height="32" viewBox="0 0 32 32" aria-hidden="true">
					<g transform="translate(16,16)">
						<circle class="rating__star-ring" fill="none" stroke="#000" stroke-width="16" r="8" transform="scale(0)" />
					</g>
					<g stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
						<g transform="translate(16,16) rotate(180)">
							<polygon class="rating__star-stroke" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="none" />
							<polygon class="rating__star-fill" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="#000" />
						</g>
						<g transform="translate(16,16)" stroke-dasharray="12 12" stroke-dashoffset="12">
							<polyline class="rating__star-line" transform="rotate(0)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(72)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(144)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(216)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(288)" points="0 4,0 16" />
						</g>
					</g>
				</svg>
				<span class="rating__sr">2 stars—Bad</span>
			</label>
			<label class="rating__label" for="rating-3">
				<svg class="rating__star" width="32" height="32" viewBox="0 0 32 32" aria-hidden="true">
					<g transform="translate(16,16)">
						<circle class="rating__star-ring" fill="none" stroke="#000" stroke-width="16" r="8" transform="scale(0)" />
					</g>
					<g stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
						<g transform="translate(16,16) rotate(180)">
							<polygon class="rating__star-stroke" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="none" />
							<polygon class="rating__star-fill" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="#000" />
						</g>
						<g transform="translate(16,16)" stroke-dasharray="12 12" stroke-dashoffset="12">
							<polyline class="rating__star-line" transform="rotate(0)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(72)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(144)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(216)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(288)" points="0 4,0 16" />
						</g>
					</g>
				</svg>
				<span class="rating__sr">3 stars—OK</span>
			</label>
			<label class="rating__label" for="rating-4">
				<svg class="rating__star" width="32" height="32" viewBox="0 0 32 32" aria-hidden="true">
					<g transform="translate(16,16)">
						<circle class="rating__star-ring" fill="none" stroke="#000" stroke-width="16" r="8" transform="scale(0)" />
					</g>
					<g stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
						<g transform="translate(16,16) rotate(180)">
							<polygon class="rating__star-stroke" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="none" />
							<polygon class="rating__star-fill" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="#000" />
						</g>
						<g transform="translate(16,16)" stroke-dasharray="12 12" stroke-dashoffset="12">
							<polyline class="rating__star-line" transform="rotate(0)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(72)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(144)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(216)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(288)" points="0 4,0 16" />
						</g>
					</g>
				</svg>
				<span class="rating__sr">4 stars—Good</span>
			</label>
			<label class="rating__label" for="rating-5">
				<svg class="rating__star" width="32" height="32" viewBox="0 0 32 32" aria-hidden="true">
					<g transform="translate(16,16)">
						<circle class="rating__star-ring" fill="none" stroke="#000" stroke-width="16" r="8" transform="scale(0)" />
					</g>
					<g stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
						<g transform="translate(16,16) rotate(180)">
							<polygon class="rating__star-stroke" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="none" />
							<polygon class="rating__star-fill" points="0,15 4.41,6.07 14.27,4.64 7.13,-2.32 8.82,-12.14 0,-7.5 -8.82,-12.14 -7.13,-2.32 -14.27,4.64 -4.41,6.07" fill="#000" />
						</g>
						<g transform="translate(16,16)" stroke-dasharray="12 12" stroke-dashoffset="12">
							<polyline class="rating__star-line" transform="rotate(0)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(72)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(144)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(216)" points="0 4,0 16" />
							<polyline class="rating__star-line" transform="rotate(288)" points="0 4,0 16" />
						</g>
					</g>
				</svg>
				<span class="rating__sr">5 stars—Excellent</span>
			</label>
			<p class="rating__display" data-rating="1" hidden>Terrible</p>
			<p class="rating__display" data-rating="2" hidden>Bad</p>
			<p class="rating__display" data-rating="3" hidden>OK</p>
			<p class="rating__display" data-rating="4" hidden>Good</p>
			<p class="rating__display" data-rating="5" hidden>Excellent</p>
		</div>
	</form>
	<script src="/js/main.js"></script>
</body>
</html>

CSS

* {
  border: 0;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #e3e4e8;
  --fg: #17181c;
  --primary: #255ff4;
  --yellow: #f4a825;
  --yellow-t: rgba(244, 168, 37, 0);
  --bezier: cubic-bezier(0.42,0,0.58,1);
  --trans-dur: 0.3s;
  font-size: calc(24px + (30 - 24) * (100vw - 320px) / (1280 - 320));
}

body {
  background-color: var(--bg);
  color: var(--fg);
  font: 1em/1.5 "DM Sans", sans-serif;
  display: flex;
  height: 100vh;
  transition: background-color var(--trans-dur), color var(--trans-dur);
}

.rating {
  margin: auto;
}
.rating__display {
  font-size: 1em;
  font-weight: 500;
  min-height: 1.25em;
  position: absolute;
  top: 100%;
  width: 100%;
  text-align: center;
}
.rating__stars {
  display: flex;
  padding-bottom: 0.375em;
  position: relative;
}
.rating__star {
  display: block;
  overflow: visible;
  pointer-events: none;
  width: 2em;
  height: 2em;
}
.rating__star-ring, .rating__star-fill, .rating__star-line, .rating__star-stroke {
  animation-duration: 1s;
  animation-timing-function: ease-in-out;
  animation-fill-mode: forwards;
}
.rating__star-ring, .rating__star-fill, .rating__star-line {
  stroke: var(--yellow);
}
.rating__star-fill {
  fill: var(--yellow);
  transform: scale(0);
  transition: fill var(--trans-dur) var(--bezier), transform var(--trans-dur) var(--bezier);
}
.rating__star-line {
  stroke-dasharray: 12 13;
  stroke-dashoffset: -13;
}
.rating__star-stroke {
  stroke: #c7cad1;
  transition: stroke var(--trans-dur);
}
.rating__label {
  cursor: pointer;
  padding: 0.125em;
}
.rating__label--delay1 .rating__star-ring, .rating__label--delay1 .rating__star-fill, .rating__label--delay1 .rating__star-line, .rating__label--delay1 .rating__star-stroke {
  animation-delay: 0.05s;
}
.rating__label--delay2 .rating__star-ring, .rating__label--delay2 .rating__star-fill, .rating__label--delay2 .rating__star-line, .rating__label--delay2 .rating__star-stroke {
  animation-delay: 0.1s;
}
.rating__label--delay3 .rating__star-ring, .rating__label--delay3 .rating__star-fill, .rating__label--delay3 .rating__star-line, .rating__label--delay3 .rating__star-stroke {
  animation-delay: 0.15s;
}
.rating__label--delay4 .rating__star-ring, .rating__label--delay4 .rating__star-fill, .rating__label--delay4 .rating__star-line, .rating__label--delay4 .rating__star-stroke {
  animation-delay: 0.2s;
}
.rating__input {
  position: absolute;
  -webkit-appearance: none;
  appearance: none;
}
.rating__input:hover ~ [data-rating]:not([hidden]) {
  display: none;
}
.rating__input-1:hover ~ [data-rating="1"][hidden], .rating__input-2:hover ~ [data-rating="2"][hidden], .rating__input-3:hover ~ [data-rating="3"][hidden], .rating__input-4:hover ~ [data-rating="4"][hidden], .rating__input-5:hover ~ [data-rating="5"][hidden], .rating__input:checked:hover ~ [data-rating]:not([hidden]) {
  display: block;
}
.rating__input-1:hover ~ .rating__label:first-of-type .rating__star-stroke, .rating__input-2:hover ~ .rating__label:nth-of-type(-n + 2) .rating__star-stroke, .rating__input-3:hover ~ .rating__label:nth-of-type(-n + 3) .rating__star-stroke, .rating__input-4:hover ~ .rating__label:nth-of-type(-n + 4) .rating__star-stroke, .rating__input-5:hover ~ .rating__label:nth-of-type(-n + 5) .rating__star-stroke {
  stroke: var(--yellow);
  transform: scale(1);
}
.rating__input-1:checked ~ .rating__label:first-of-type .rating__star-ring, .rating__input-2:checked ~ .rating__label:nth-of-type(-n + 2) .rating__star-ring, .rating__input-3:checked ~ .rating__label:nth-of-type(-n + 3) .rating__star-ring, .rating__input-4:checked ~ .rating__label:nth-of-type(-n + 4) .rating__star-ring, .rating__input-5:checked ~ .rating__label:nth-of-type(-n + 5) .rating__star-ring {
  animation-name: starRing;
}
.rating__input-1:checked ~ .rating__label:first-of-type .rating__star-stroke, .rating__input-2:checked ~ .rating__label:nth-of-type(-n + 2) .rating__star-stroke, .rating__input-3:checked ~ .rating__label:nth-of-type(-n + 3) .rating__star-stroke, .rating__input-4:checked ~ .rating__label:nth-of-type(-n + 4) .rating__star-stroke, .rating__input-5:checked ~ .rating__label:nth-of-type(-n + 5) .rating__star-stroke {
  animation-name: starStroke;
}
.rating__input-1:checked ~ .rating__label:first-of-type .rating__star-line, .rating__input-2:checked ~ .rating__label:nth-of-type(-n + 2) .rating__star-line, .rating__input-3:checked ~ .rating__label:nth-of-type(-n + 3) .rating__star-line, .rating__input-4:checked ~ .rating__label:nth-of-type(-n + 4) .rating__star-line, .rating__input-5:checked ~ .rating__label:nth-of-type(-n + 5) .rating__star-line {
  animation-name: starLine;
}
.rating__input-1:checked ~ .rating__label:first-of-type .rating__star-fill, .rating__input-2:checked ~ .rating__label:nth-of-type(-n + 2) .rating__star-fill, .rating__input-3:checked ~ .rating__label:nth-of-type(-n + 3) .rating__star-fill, .rating__input-4:checked ~ .rating__label:nth-of-type(-n + 4) .rating__star-fill, .rating__input-5:checked ~ .rating__label:nth-of-type(-n + 5) .rating__star-fill {
  animation-name: starFill;
}
.rating__input-1:not(:checked):hover ~ .rating__label:first-of-type .rating__star-fill, .rating__input-2:not(:checked):hover ~ .rating__label:nth-of-type(2) .rating__star-fill, .rating__input-3:not(:checked):hover ~ .rating__label:nth-of-type(3) .rating__star-fill, .rating__input-4:not(:checked):hover ~ .rating__label:nth-of-type(4) .rating__star-fill, .rating__input-5:not(:checked):hover ~ .rating__label:nth-of-type(5) .rating__star-fill {
  fill: var(--yellow-t);
}
.rating__sr {
  clip: rect(1px, 1px, 1px, 1px);
  overflow: hidden;
  position: absolute;
  width: 1px;
  height: 1px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181c;
    --fg: #e3e4e8;
  }

.rating {
    margin: auto;
  }
  .rating__star-stroke {
    stroke: #454954;
  }
}
@keyframes starRing {
  from, 20% {
    animation-timing-function: ease-in;
    opacity: 1;
    r: 8px;
    stroke-width: 16px;
    transform: scale(0);
  }
  35% {
    animation-timing-function: ease-out;
    opacity: 0.5;
    r: 8px;
    stroke-width: 16px;
    transform: scale(1);
  }
  50%, to {
    opacity: 0;
    r: 16px;
    stroke-width: 0;
    transform: scale(1);
  }
}
@keyframes starFill {
  from, 40% {
    animation-timing-function: ease-out;
    transform: scale(0);
  }
  60% {
    animation-timing-function: ease-in-out;
    transform: scale(1.2);
  }
  80% {
    transform: scale(0.9);
  }
  to {
    transform: scale(1);
  }
}
@keyframes starStroke {
  from {
    transform: scale(1);
  }
  20%, to {
    transform: scale(0);
  }
}
@keyframes starLine {
  from, 40% {
    animation-timing-function: ease-out;
    stroke-dasharray: 1 23;
    stroke-dashoffset: 1;
  }
  60%, to {
    stroke-dasharray: 12 13;
    stroke-dashoffset: -13;
  }
}

JS

window.addEventListener("DOMContentLoaded",() => {
	const starRating = new StarRating("form");
});

class StarRating {
	constructor(qs) {
		this.ratings = [
			{id: 1, name: "Terrible"},
			{id: 2, name: "Bad"},
			{id: 3, name: "OK"},
			{id: 4, name: "Good"},
			{id: 5, name: "Excellent"}
		];
		this.rating = null;
		this.el = document.querySelector(qs);

this.init();
	}
	init() {
		this.el?.addEventListener("change",this.updateRating.bind(this));

// stop Firefox from preserving form data between refreshes
		try {
			this.el?.reset();
		} catch (err) {
			console.error("Element isn’t a form.");
		}
	}
	updateRating(e) {
		// clear animation delays
		Array.from(this.el.querySelectorAll(`[for*="rating"]`)).forEach(el => {
			el.className = "rating__label";
		});

const ratingObject = this.ratings.find(r => r.id === +e.target.value);
		const prevRatingID = this.rating?.id || 0;

let delay = 0;
		this.rating = ratingObject;
		this.ratings.forEach(rating => {
			const { id } = rating;

// add the delays
			const ratingLabel = this.el.querySelector(`[for="rating-${id}"]`);

if (id > prevRatingID + 1 && id <= this.rating.id) {
				++delay;
				ratingLabel.classList.add(`rating__label--delay${delay}`);
			}

// hide ratings to not read, show the one to read
			const ratingTextEl = this.el.querySelector(`[data-rating="${id}"]`);

if (this.rating.id !== id)
				ratingTextEl.setAttribute("hidden",true);
			else
				ratingTextEl.removeAttribute("hidden");
		});
	}
}

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