W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
#container {
  width: 80%;
  aspect-ratio: 2/1;
  margin: auto;
  border: solid black 2px;
  overflow-x: scroll;
  overflow-y: hidden;
  white-space: nowrap;
  scroll-snap-type: x mandatory;
}

.blue {
  background-color: lightblue;
  height: 95%;
  aspect-ratio: 3/4;
}

.green {
  background-color: lightgreen;
  height: 80%;
  aspect-ratio: 2/3;
}

.blue, .green {
  margin: 2px;
  display: inline-block;
  scroll-snap-align: start;
  scroll-margin-inline: 0;
}
</style>
</head>
<body>

<h1>Change scroll-margin-inline property with JavaScript</h1>

<p>Try first to scroll to see how the scroll snaps on start of elements in inline direction.</p>

<p>Now, click button, click inside the container, and see how scrolling behaviour has changed. The elements still snap on start of element like before, but now with a 20px margin to container at the start of the elements in inline direction.</p>

</body>
</html>

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<!DOCTYPE html><html><head><style>#container {  width: 80%;  aspect-ratio: 2/1;  margin: auto;  border: solid black 2px;  overflow-x: scroll;  overflow-y: hidden;  white-space: nowrap;  scroll-snap-type: x mandatory;}​.blue {  background-color: lightblue;  height: 95%;  aspect-ratio: 3/4;}​.green {  background-color: lightgreen;  height: 80%;  aspect-ratio: 2/3;}​.blue, .green {  margin: 2px;  display: inline-block;  scroll-snap-align: start;  scroll-margin-inline: 0;}</style></head><body>​<h1>Change scroll-margin-inline property with JavaScript</h1>​<p>Try first to scroll to see how the scroll snaps on start of elements in inline direction.</p>​<p>Now, click button, click inside the container, and see how scrolling behaviour has changed. The elements still snap on start of element like before, but now with a 20px margin to container at the start of the elements in inline direction.</p>​<button onclick="myFunction()">Try it</button>​<div id="container">  <div class="blue"></div>