W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
#container, #pinkDiv, #yellowDiv {
  margin: 15px;
  padding: 3px;
  border: solid black 1px;
  overflow: auto;
}

#container > p {
  width: 200%;
}

#container {
  background-color: rgb(197, 255, 236);
  height: 370px;
}

#leftDiv {
  float: left;
  width: 60%;
}

#pinkDiv, #yellowDiv {
  height: 150px;
  width: 80%;
}

#pinkDiv {
  background-color: rgb(255, 205, 213);
  writing-mode: vertical-rl;
}

#yellowDiv {
  background-color: rgb(255, 255, 161);
  writing-mode: vertical-rl;
  overscroll-behavior-block: contain;
}
</style>
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<body>

<h1>Try yellow box with no overscroll chaining in the block-direction</h1>

<p>The writing-mode property value 'vertical-rl' changes block-direction from the y-axis to the x-axis, so now the overscroll-behavior-block works in the x-direction instead of the y-direction.</p>

<p>Put the mouse pointer over the pink box, continue scrolling right, and the scrolling behavior will transfer to the green parent element. This is called overscroll chaining, when overscrolling on one element leads to scrolling behavior on the parent element. Scroll chaining is default behavior.</p>

<p><strong>Note: </strong>To scroll sideways in the x-direction to trigger overscroll-behavior, you might need to use swipe-gesture on a touchpad or a touchscreen.</p>

<p>Now, scroll to the left again, move mouse pointer down to the yellow box, continue to scroll right, and you will see that scrolling is NOT transferred to the parent element in this case, bacause of the overscroll-behavior-block property value 'contain' that prevents this from happening.</p>

<div id="leftDiv">
    <div id="pinkDiv">
      <h2>With overscroll chaining in the x-direction</h2>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque consequat leo eu odio feugiat luctus. Duis vel sagittis ipsum, non dictum nisl. Vivamus sit amet volutpat metus. Nunc tempus, mi ut vehicula porttitor, velit lacus sagittis lorem, sit amet venenatis mauris nibh sit amet urna. Nam nibh mi, commodo id diam eu, congue suscipit nunc. Vestibulum scelerisque dui tempus tincidunt luctus. Donec placerat quis neque vel ultrices. Pellentesque dignissim placerat orci sed cursus. Ut convallis leo sapien, vitae ornare nulla sodales at. Suspendisse ut vestibulum erat. Sed ut fermentum tortor. Integer quis tellus eget nisi pharetra pharetra non vitae magna. Cras ultricies, nulla id imperdiet varius, nisi odio finibus diam, at finibus lacus risus vel dui. Ut euismod consequat libero eu pharetra.</p>
    </div>
    <div id="yellowDiv">
      <h2>No overscroll chaining in the x-direction</h2>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque consequat leo eu odio feugiat luctus. Duis vel sagittis ipsum, non dictum nisl. Vivamus sit amet volutpat metus. Nunc tempus, mi ut vehicula porttitor, velit lacus sagittis lorem, sit amet venenatis mauris nibh sit amet urna. Nam nibh mi, commodo id diam eu, congue suscipit nunc. Vestibulum scelerisque dui tempus tincidunt luctus. Donec placerat quis neque vel ultrices. Pellentesque dignissim placerat orci sed cursus. Ut convallis leo sapien, vitae ornare nulla sodales at. Suspendisse ut vestibulum erat. Sed ut fermentum tortor. Integer quis tellus eget nisi pharetra pharetra non vitae magna. Cras ultricies, nulla id imperdiet varius, nisi odio finibus diam, at finibus lacus risus vel dui. Ut euismod consequat libero eu pharetra.</p>
    </div>
  </div>
  
  
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque consequat leo eu odio feugiat luctus. Duis vel sagittis ipsum, non dictum nisl. Vivamus sit amet volutpat metus. Nunc tempus, mi ut vehicula porttitor, velit lacus sagittis lorem, sit amet venenatis mauris nibh sit amet urna. Nam nibh mi, commodo id diam eu, congue suscipit nunc. Vestibulum scelerisque dui tempus tincidunt luctus. Donec placerat quis neque vel ultrices. Pellentesque dignissim placerat orci sed cursus. Ut convallis leo sapien, vitae ornare nulla sodales at. Suspendisse ut vestibulum erat. Sed ut fermentum tortor. Integer quis tellus eget nisi pharetra pharetra non vitae magna. Cras ultricies, nulla id imperdiet varius, nisi odio finibus diam, at finibus lacus risus vel dui. Ut euismod consequat libero eu pharetra.</p>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque consequat leo eu odio feugiat luctus. Duis vel sagittis ipsum, non dictum nisl. Vivamus sit amet volutpat metus. Nunc tempus, mi ut vehicula porttitor, velit lacus sagittis lorem, sit amet venenatis mauris nibh sit amet urna. Nam nibh mi, commodo id diam eu, congue suscipit nunc. Vestibulum scelerisque dui tempus tincidunt luctus. Donec placerat quis neque vel ultrices. Pellentesque dignissim placerat orci sed cursus. Ut convallis leo sapien, vitae ornare nulla sodales at. Suspendisse ut vestibulum erat. Sed ut fermentum tortor. Integer quis tellus eget nisi pharetra pharetra non vitae magna. Cras ultricies, nulla id imperdiet varius, nisi odio finibus diam, at finibus lacus risus vel dui. Ut euismod consequat libero eu pharetra.</p>

</body>
</html>