chromium/third_party/blink/web_tests/virtual/css-custom-state-only-deprecated-syntax/external/wpt/custom-elements/state/ElementInternals-states-expected.txt

This is a testharness.js-based test.
[FAIL] CustomStateSet behavior of ElementInternals.states: Exceptions
  Failed to execute 'add' on 'CustomStateSet': The specified value '' must start with '--'.
Harness: the test ran to completion.