area-at-exact-proximity-range-doesnt-crash.html

<!DOCTYPE html>
<html>
  <body>
    <style>
      #scroller {
        scroll-snap-type: y proximity;
        height: 300px;
        width: 200px;
        border: solid 1px black;
        overflow-y: scroll;
        overflow-x: hidden;
        position: relative;
      }
      .snaparea {
        scroll-snap-align: start;
        width: 100px;
        height: 100px;
        background-color: green;
        position: absolute;
        /*
          third_party/blink/renderer/core/page/scrolling/snap_coordinator.cc
          defines kProximityRatio as 1/3.
          This test tests that there is no crash due to a snap area at a
          distance of exactly the proximity range (1/3 of the container's
          height, i.e. 100px since the container has height 300px).
        */
        top: 100px;
      }
      .space {
        height: 200vh;
        width: 200vw;
      }
    </style>
    <div id="scroller">
      <div class="space"></div>
      <div class="snaparea"></div>
    </div>
    <p>This test passes if it doesn't crash</p>
    <script>
      if (window.testRunner)
            testRunner.dumpAsText();
    </script>
  </body>
</html>

chromium/third_party/blink/web_tests/fast/scrolling/area-at-exact-proximity-range-doesnt-crash.html