W3School TIY Editor

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

.blue {
  background-color: lightblue;
  width: 95%;
  aspect-ratio: 3/1;
}

.green {
  background-color: lightgreen;
  width: 80%;
  aspect-ratio: 4/1;
}

.blue, .green {
  margin: 2px;
  scroll-snap-align: start none;
  scroll-margin-inline-start: 20px;
  writing-mode: vertical-rl;
}
</style>
</head>
<body>

<h1>CSS scroll-margin-inline-start 属性</h1>

<p>当 writing-mode 属性值设置为 vertical-rl 时，元素在行内方向上的起始位置从左侧变为顶部，这也会影响 scroll-margin-inline-start 属性。</p>

<p>在此例中，吸附位置设置为在块方向上开始。为了在 writing-mode 为 vertical-rl 的情况下，在此吸附位置为子元素和容器之间设置外边距，将 scroll-margin-inline-start 属性的值设置为 20 像素。</p>

<div id="container">
  <div class="blue">Blue</div>
  <div class="green">Green</div>
  <div class="blue">Blue</div>
  <div class="green">Green</div>
  <div class="blue">Blue</div>
  <div class="green">Green</div>
  <div class="blue">Blue</div>
</div>

</body>
</html>