osition-try --f3 { left: 10px; }
  @position-try --f4 { left: 10px; }
  @position-try --f5 { left: 20px; width: 20px; /* not overflowing #container */ }
  #t2 {
    position-try-fallbacks: --f1, --f2, --f3, --f4, --f5;
  }

</style>
<div id="container">
  <div id="t1" class="positioned"></div>
  <div id="t2" class="positioned"></div>
</div>
<script>
  test(() => {
      assert_equals(t1.offsetLeft, 0, "The --bar try fallback should be applied");
  }, "Try fallbacks which are not found are not part of the li