firefox/testing/web-platform/meta/shadow-dom/reference-target/tentative/reference-target-basics.html.ini

[reference-target-basics.html]
  [ShadowRoot.referenceTarget defaults to empty string when shadow is created declaratively]
    expected: FAIL

  [<template> shadowrootreferencetarget sets referenceTarget on shadow root]
    expected: FAIL

  [ShadowRoot.referenceTarget defaults to empty string when shadow is created imperatively]
    expected: FAIL

  [ShadowRootInitDict can be used to set referenceTarget on shadow root]
    expected: FAIL