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    <head>
      <base href="https://bugs.webkit.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Incorrect KeyframesEffect generated for background"
   href="https://bugs.webkit.org/show_bug.cgi?id=229398">229398</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Incorrect KeyframesEffect generated for background
          </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>Animations
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>mattgperry@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dino@apple.com, graouts@apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Visit this sandbox in Safari: <a href="https://codesandbox.io/s/waapi-webkit-iteration-timing-bug-forked-8ozd3?file=/src/index.js">https://codesandbox.io/s/waapi-webkit-iteration-timing-bug-forked-8ozd3?file=/src/index.js</a>

The middle box fails to animate `background`.

Logging the generated KeyframeEffect reveals the first keyframe contains `background: #ff2965` as expected. However, the final keyframe contains `backgroundImage: ""`

Either:
  - Removing `opacity` keyframes OR
  - Removing one `transform` keyframe

Will fix this, and all three boxes will animate `background` as expected.</pre>
        </div>
      </p>


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