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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Busted IntersectionObserver demo when scrolling w/ insertBefore"
   href="https://bugs.webkit.org/show_bug.cgi?id=241493">241493</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Busted IntersectionObserver demo when scrolling w/ insertBefore
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>Safari Technology Preview
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DOM
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>miketaylr@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>(sorry, bad title)

This was originally filed against the IntersectionObserver spec: <a href="https://github.com/w3c/IntersectionObserver/issues/472">https://github.com/w3c/IntersectionObserver/issues/472</a>

STR: 
1. go to <a href="https://jsfiddle.net/90sw7dhf/">https://jsfiddle.net/90sw7dhf/</a>
2. scroll down

Expected: in Firefox and Chrome, alternating green and blue divs, infinitely

Actual: in Safari TP, green turns blue, then a different shade of blue and that's it.

The jsfiddle has a log, and it seems like it's looping forever when trying to log "wow".</pre>
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