File: position-visibility-initial.html

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<!DOCTYPE html>
<meta charset="utf-8">
<meta name="assert" content="Position-visibility: anchors-visible should be the initial value." />
<title>CSS Anchor Positioning Test: position-visibility: anchors-visible</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-visibility">
<link rel="match" href="position-visibility-initial-ref.html">
<style>
  #scroll-container {
    overflow: hidden scroll;
    width: 300px;
    height: 100px;
  }

  #anchor {
    anchor-name: --a1;
    width: 100px;
    height: 100px;
    background: orange;
  }

  #spacer {
    height: 100px;
  }

  #target {
    position-anchor: --a1;
    position-area: bottom right;
    width: 100px;
    height: 100px;
    background: red;
    position: absolute;
    top: 0;
    left: 0;
  }
</style>

<div id="scroll-container">
  <div id="anchor">anchor</div>
  <div id="spacer"></div>
  <div id="target">target</div>
</div>

<script>
  const scroller = document.getElementById('scroll-container');
  scroller.scrollTop = 100;
  // #target should not be visible because #anchor is scrolled out of view.
</script>