File: position-visibility-anchors-valid.tentative.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Anchor Positioning Test: position-visibility: anchors-valid</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-visibility">
<link rel="match" href="position-visibility-anchors-valid-ref.html">
<style>
  .anchor {
    width: 100px;
    height: 100px;
    background: orange;
    display: inline-block;
  }

  .target {
    position: absolute;
    position-visibility: anchors-valid;
    position-area: block-end;
    width: 100px;
    height: 100px;
    background: red;
    top: 0;
    left: 0;
  }
</style>

<!-- #target1 should be visible. -->
<div class="anchor" style="anchor-name: --a1;">anchor1</div>
<div id="target1" class="target" style="position-anchor: --a1; background: green">target1</div>

<!-- #target2 should not be visible because anchor name does not exist. -->
<div id="target2" class="target" style="top: anchor(--does-not-exist bottom);">target2</div>