File: popover-anchor-change-display.tentative.html

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<!DOCTYPE html>
<meta charset="utf-8">
<link rel=author href="mailto:xiaochengh@chromium.org">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<link rel=match href="popover-anchor-change-display-ref.html">
<script src="resources/popover-utils.js"></script>

<p>There should be a green box attached to the right side of each orange box.</p>

<div class=ex>
  <div class=anchor id=anchor1></div>
  <div id=popover1 popover=manual defaultopen></div>
</div>

<div class=ex>
  <div class=anchor id=will-be-anchor2></div>
  <div id=popover2 popover=manual anchor=anchor2 defaultopen></div>
</div>

<script>
showDefaultopenPopoversOnLoad();

function runTest() {
  document.body.offsetLeft; // Force layout

  document.getElementById('popover1').setAttribute('anchor', 'anchor1');
  document.getElementById('will-be-anchor2').setAttribute('id', 'anchor2');
}
window.addEventListener('load', runTest);
</script>

<style>
  .ex {
    margin: 25px;
  }
  .ex div {
    width: 100px;
    height: 100px;
  }
  .anchor {
    background: orange;
  }
  [popover] {
    inset: auto;
    background: lime;
    padding:0;
    border:0;
    left: anchor(right);
    top: anchor(top);
  }
</style>