"scroll animation in js"
Bootstrap 4.1.1 Snippet by ALIMUL AL RAZY

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<p>Scroll down this page.</p>
<p>When you have scrolled 350px from the top, an image will slide in.</p>
<hr>
<div class="col-1">
<img id="myImg" src="https://placeimg.com/640/480/nature" width="304" height="228">
</div>
<div class="col-2">
Just some text..
</div>
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.slideUp {
animation-name: slideUp;
-webkit-animation-name: slideUp;
animation-duration: 1s;
-webkit-animation-duration: 1s;
visibility: visible;
}
@keyframes slideUp {
0% {
opacity: 0;
-webkit-transform: translateY(70%);
}
100% {
opacity: 1;
-webkit-transform: translateY(0%);
}
}
@-webkit-keyframes slideUp {
0% {
opacity: 0;
-webkit-transform: translateY(70%);
}
100% {
opacity: 1;
-webkit-transform: translateY(0%);
}
}
body {height:1500px;}
.col-1 {float:left}
.col-2 {float:left;padding-left:25px;}
img {width:180px;height:100px;visibility:hidden;}
hr {margin-top:400px;}
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window.onscroll = function() {myFunction()};
function myFunction() {
if (document.body.scrollTop > 350 || document.documentElement.scrollTop > 350) {
document.getElementById("myImg").className = "slideUp";
}
}
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