osvik/index.html

## index.html
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Animate CSS</title>
    <!-- https://animate.style/ -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/4.1.1/animate.min.css" />
</head>

<body>

    <style>
        #my-element {
            background-color: rgb(65, 165, 165);
        }
    </style>

    <div id="my-element" hidden="hidden" class="animate__faster">
        <h1>An animated element</h1>
        <p>To test enter and leave</p>
    </div>

    <div>
        <button onclick="enter('#my-element', 'slideInLeft');">Enter</button>
        <button onclick="leave('#my-element', 'slideOutLeft');">Leave</button>
    </div>

    <script>
        const animateCSS = (element, animation, prefix = 'animate__') =>
            new Promise((resolve, reject) => {
                const animationName = `${prefix}${animation}`;
                const node = document.querySelector(element);
                node.classList.add(`${prefix}animated`, animationName);
                function handleAnimationEnd(event) {
                    event.stopPropagation();
                    node.classList.remove(`${prefix}animated`, animationName);
                    resolve('Animation ended');
                }
                node.addEventListener('animationend', handleAnimationEnd, { once: true });
            });
    </script>
    <script>
        const enter = function (element, animation) {
            const el = document.querySelector(element);
            if (el.hasAttribute("hidden")) {
                el.removeAttribute("hidden");
                animateCSS(element, animation).then((message) => {
                    // Follow up
                });
            }
        };
        const leave = function (element, animation) {
            const el = document.querySelector(element);
            if (!el.hasAttribute("hidden")) {
                animateCSS(element, animation).then((message) => {
                    // Follow up
                    el.setAttribute("hidden", "hidden");
                });
            }
        };
    </script>

</body>

</html>
	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Animate CSS</title>
	<!-- https://animate.style/ -->
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/4.1.1/animate.min.css" />
	</head>

	<body>

	<style>
	#my-element {
	background-color: rgb(65, 165, 165);
	}
	</style>

	<div id="my-element" hidden="hidden" class="animate__faster">
	<h1>An animated element</h1>
	<p>To test enter and leave</p>
	</div>

	<div>
	<button onclick="enter('#my-element', 'slideInLeft');">Enter</button>
	<button onclick="leave('#my-element', 'slideOutLeft');">Leave</button>
	</div>

	<script>
	const animateCSS = (element, animation, prefix = 'animate__') =>
	new Promise((resolve, reject) => {
	const animationName = `${prefix}${animation}`;
	const node = document.querySelector(element);
	node.classList.add(`${prefix}animated`, animationName);
	function handleAnimationEnd(event) {
	event.stopPropagation();
	node.classList.remove(`${prefix}animated`, animationName);
	resolve('Animation ended');
	}
	node.addEventListener('animationend', handleAnimationEnd, { once: true });
	});
	</script>
	<script>
	const enter = function (element, animation) {
	const el = document.querySelector(element);
	if (el.hasAttribute("hidden")) {
	el.removeAttribute("hidden");
	animateCSS(element, animation).then((message) => {
	// Follow up
	});
	}
	};
	const leave = function (element, animation) {
	const el = document.querySelector(element);
	if (!el.hasAttribute("hidden")) {
	animateCSS(element, animation).then((message) => {
	// Follow up
	el.setAttribute("hidden", "hidden");
	});
	}
	};
	</script>

	</body>

	</html>