0px;
    background-color: coral;
  }
  #target {
    position: absolute;
    left: 450px; /* force fallback */
    width: 40px;
    height: 40px;
    background-color: skyblue;
  }
</style>
<style id=style>
</style>
<div id=cb>
  <div id=target></div>
</div>
<script>

function test_computed_value(try_tactic, property, value, expected, direction, writing_mode) {
  if (direction==undefined) {
    direction = 'ltr';
  }
  if (writing_mode==undefined) {
    writing_mode = 'horizontal-tb';
  }
  test((t) => {
 