swc/crates/swc_css_parser/tests/fixture/at-rule/unknown/output.json

{
  "type": "Stylesheet",
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    "end": 666,
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  },
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      "type": "UnknownAtRule",
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    {
      "type": "UnknownAtRule",
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            }
          }
        ]
      }
    }
  ]
}