css/css-overflow/overflow-auto-scrollbar-gutter-intrinsic-003-ref.html

<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Overflow Test: scrollbar-gutter size doesn't contribute to the scroll container's intrinsic size with "overflow:auto" and "scrollbar-width: none"</title>
  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
  <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#scrollbar-gutter-property">
  <link rel="help" href="https://drafts.csswg.org/css-scrollbars/#scrollbar-width">

  <style>
  .line {
    display: flex;
  }
  .container {
    block-size: 50px;
    border: 5px solid black;
    margin: 10px;
  }
  </style>

  <div class="line">
    <div class="container">
      <div>I should not wrap</div>
    </div>

    <div class="container">
      <div>I should not wrap</div>
    </div>
  </div>

  <div class="line">
    <div class="container" style="writing-mode: vertical-rl">
      <div>I should not wrap</div>
    </div>

    <div class="container" style="writing-mode: vertical-rl">
      <div>I should not wrap</div>
    </div>

    <div class="container" style="writing-mode: vertical-lr">
      <div>I should not wrap</div>
    </div>

    <div class="container" style="writing-mode: vertical-lr">
      <div>I should not wrap</div>
    </div>
  </div>
</html>