File: position-area-ambiguous-self.html

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<!DOCTYPE html>
<title>CSS Anchor Positioning: position-area with writing-mode and direction</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position/#position-area">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #abs-container {
    writing-mode: vertical-lr;
    position: absolute;
    width: 400px;
    height: 400px;
  }
  #anchor {
    anchor-name: --a;
    width: 100px;
    height: 100px;
  }
  #anchored {
    position: absolute;
    writing-mode: horizontal-tb;
    direction: rtl;
    position-anchor: --a;
    position-area: self-end self-start;
    width: 100px;
    height: 100px;
  }
</style>
<div id="abs-container">
  <div id="anchor"></div>
  <div id="anchored"></div>
</div>
<script>
  test(() => {
    assert_equals(anchored.offsetTop, 100, "positioned below the anchor");
    assert_equals(anchored.offsetLeft, 100, "positioned to the right of the anchor");
  }, "'self-end self-start' of horizontal-tb/rtl is physically 'bottom right'");
</script>