<!doctype html>
<meta charset="utf-8">
<title>CSS Overflow: overflow-clip-margin: invalidation on change</title>
<link rel="help" href="https://www.w3.org/TR/css-overflow-3/#propdef-overflow-clip-margin">
<link rel="author" title="Scott Violet" href="mailto:sky@chromium.org">
<style>
  .container {
      display: flex;
  }
  .parent_overflow {
      position: relative;
      top: -10px;
      left: -10px;
      width: 120px;
      height: 120px;
      flex: none;
      background-color: green;
  }
  .parent {
      width: 100px;
      height: 100px;
      flex: none;
      background-color: green;
  }
  .spacer {
      flex: none;
      height: 100px;
      width: 100px;
  }

</style>
<div class="spacer"></div>
<div class="container">
  <div class="spacer"></div>
  <div class="parent"></div>
<div class="spacer"></div>
<div class="container">
  <div class="spacer"></div>
  <div class="parent_overflow"></div>
</body>