Live Demo: Example of jQuery Fade-In and Fade-Out Effects with Different Speeds

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Example of jQuery Fade-In and Fade-Out Effects with Different Speeds</title>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<style>
    p{
        padding: 15px;
        background: #DDA0DD;
    }
</style>
<script>
$(document).ready(function(){
    // Fading out displayed paragraphs with different speeds
    $(".out-btn").click(function(){
        $("p.normal").fadeOut();
        $("p.fast").fadeOut("fast");
        $("p.slow").fadeOut("slow");
        $("p.very-fast").fadeOut(50);
        $("p.very-slow").fadeOut(2000);
    });
    
    // Fading in hidden paragraphs with different speeds
    $(".in-btn").click(function(){
        $("p.normal").fadeIn();
        $("p.fast").fadeIn("fast");
        $("p.slow").fadeIn("slow");
        $("p.very-fast").fadeIn(50);
        $("p.very-slow").fadeIn(2000);
    });
});
</script>
</head>
<body>
    <button type="button" class="out-btn">Fade Out Paragraphs</button>
    <button type="button" class="in-btn">Fade In Paragraphs</button>
    <p class="very-fast">This paragraph will fade in/out with very fast speed.</p>
    <p class="normal">This paragraph will fade in/out with default speed.</p>
    <p class="fast">This paragraph will fade in/out with fast speed.</p>
    <p class="slow">This paragraph will fade in/out with slow speed.</p>
    <p class="very-slow">This paragraph will fade in/out with very slow speed.</p>
</body>
</html>