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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/parsing/position-try-parsing.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Anchor Positioning Test: Parsing of position-try shorthand</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-try-prop">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script src="/css/support/shorthand-testcommon.js"></script>
<script>
  test_valid_value("position-try", "flip-inline");
  test_valid_value("position-try", "most-height none");
  test_valid_value("position-try", "--bar, --baz");
  test_valid_value("position-try", "most-inline-size --baz, flip-inline");
  test_valid_value("position-try", "most-block-size flip-inline flip-block, --bar, --baz");
  test_valid_value("position-try", "normal none", "none");
  test_valid_value("position-try", "most-width none");
  test_valid_value("position-try", "normal --foo", "--foo");

  test_invalid_value("position-try", "normal --foo, most-width --bar");
  test_invalid_value("position-try", "none normal");
  test_invalid_value("position-try", "flip-block most-height");
  test_invalid_value("position-try", "most-height, flip-start");

  test_shorthand_value("position-try", "flip-inline", {
    "position-try-order": "normal",
    "position-try-fallbacks": "flip-inline",
  });
  test_shorthand_value("position-try", "most-width none", {
    "position-try-order": "most-width",
    "position-try-fallbacks": "none",
  });
  test_shorthand_value("position-try", "--foo, --bar", {
    "position-try-order": "normal",
    "position-try-fallbacks": "--foo, --bar",
  });
  test_shorthand_value("position-try", "most-inline-size --foo, flip-inline", {
    "position-try-order": "most-inline-size",
    "position-try-fallbacks": "--foo, flip-inline",
  });
  test_shorthand_value("position-try", "most-inline-size flip-inline flip-block, --foo, --bar", {
    "position-try-order": "most-inline-size",
    "position-try-fallbacks": "flip-inline flip-block, --foo, --bar",
  });
</script>