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App.svelte
<!-- https://eugenkiss.github.io/7guis/tasks#timer -->

<script>
	import { onDestroy } from 'svelte';

	let elapsed = 0;
	let duration = 5000;

	let last_time = window.performance.now();
	let frame;

	(function update() {
		frame = requestAnimationFrame(update);

		const time = window.performance.now();
		elapsed += Math.min(
			time - last_time,
			duration - elapsed
		);

		last_time = time;
	}());

	onDestroy(() => {
		cancelAnimationFrame(frame);
	});
</script>

<label>
	elapsed time:
	<progress value="{elapsed / duration}"></progress>
</label>

<div>{(elapsed / 1000).toFixed(1)}s</div>

<label>
	duration:
	<input type="range" bind:value={duration} min="1" max="20000">
</label>

<button on:click="{() => elapsed = 0}">reset</button>
loading editor...

Console

loading Svelte compiler...
 
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Compiler options

result = svelte.compile(source, {
generate:
});
 
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No AST available

The AST is not public API and may change at any point in time