position-try-fallbacks-limit.html | Explore in Territory

<!DOCTYPE html>
<title>CSS Anchor Positioning Test: position fallbacks list limit</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback-apply">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #container {
    position: relative;
    width: 200px;
    height: 200px;
  }
  .positioned {
    width: 200px;
    height: 200px;
    position: absolute;
    top: 0;
    left: 10px; /* overflowing #container */
  }

  @position-try --bar {
    left: 0; /* not overflowing #container */
  }
  #t1 {
    /* If --foo is not found, we should still try --bar even if we limit the
       number of applied position fallbacks to five because the --foo's are not
       added to the `position fallbacks list` per spec. */
    position-try-fallbacks: --foo, --foo, --foo, --foo, --foo, --foo, --foo, --bar;
  }

  /* --f1 .. --f4 all overflowing #container */
  @position-try --f1 { left: 10px; }
  @position-try --f2 { left: 10px; }
  @position-try --f3 { left: 10px; }
  @position-try --f4 { left: 10px; }
  @position-try --f5 { left: 20px; width: 20px; /* not overflowing #container */ }
  #t2 {
    position-try-fallbacks: --f1, --f2, --f3, --f4, --f5;
  }

</style>
<div id="container">
  <div id="t1" class="positioned"></div>
  <div id="t2" class="positioned"></div>
</div>
<script>
  test(() => {
      assert_equals(t1.offsetLeft, 0, "The --bar try fallback should be applied");
  }, "Try fallbacks which are not found are not part of the limit");

  test(() => {
      assert_equals(t2.offsetLeft, 20, "The --f5 try fallback should be applied");
  }, "Must support At least five try fallbacks");
</script>
chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/position-try-fallbacks-limit.html
