File: tile-opacity.html

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leaflet 1.4.0~dfsg-5
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<!DOCTYPE html>
<html>
<head>
	<title>Leaflet debug page</title>

	<link rel="stylesheet" href="../../dist/leaflet.css" />

	<meta name="viewport" content="width=device-width, initial-scale=1.0">

	<link rel="stylesheet" href="../css/screen.css" />

	<script src="../leaflet-include.js"></script>
	<style>
	</style>
</head>
<body>

	The opacity of the "toner" layer should pulse nicely, even when dragging/zooming the map around with new tiles.
	<div id="map" class="map"></div>

	<script>
		var mapopts =  {
			center: [35, -122],
			zoom : 5
		};

		var map = L.map('map', mapopts);

		var watercolorUrl = 'http://{s}.tile.stamen.com/watercolor/{z}/{x}/{y}.jpg';
		var watercolor = L.tileLayer(watercolorUrl, {maxZoom: 18, attribution: 'Map by Stamen, map data OpenStreetMap'}).addTo(map);

		var tonerUrl = 'http://{s}.tile.stamen.com/toner/{z}/{x}/{y}.png';
		var toner = L.tileLayer(tonerUrl, {maxZoom: 18, attribution: ''}).addTo(map);

		window.setInterval(function(){
			// Sine function, phase shifts one radian every sec.
			var opacity = 0.6 + 0.4 * Math.sin(Date.now() / 1000);
			toner.setOpacity(opacity);
		}, 200);

	</script>
</body>
</html>