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chromium/third_party/blink/web_tests/external/wpt/css/css-scroll-snap/support/scroll-target-align-001-iframe.html 

<!DOCTYPE html>
<title>iframe for #target and snap position with snapping off</title>
<style type='text/css'>
  html, body {
    margin: 0; padding: 0;
  }
  html {
    /* to make failing more obvious */
    background: 0 1em / 100% 1em linear-gradient(red, red) repeat-x fixed;
    /* avoid anti-aliasing issues */
    font: 20px/1 sans-serif;
    scrollbar-width: none;
  }
  div {
    height: 1em;
  }
  html    { scroll-padding:   .5em 0 0; } /* set up a snap position      */
  #target { scroll-margin:    .5em 0 0;
            scroll-snap-align:  center; }
  #stripe { background: green;          } /* color part of the snap area */
  .fail   { color: red;                 } /* make failing more obvious   */

  /* emulate `scrollbar-width: none` for browsers that don't support it yet */
  ::-webkit-scrollbar { display: none; }
</style>

<div></div>
<div></div>
<div></div>
<div></div>
<div class="fail">FAIL</div>
<div></div>
<div id="stripe"></div>
<div id="target"></div>
<div></div>
<div class="fail">FAIL</div>
<div></div>
<div></div>
<div></div>
<div></div>