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            "standard_track": true,
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                "version_added": "42"
              },
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                "version_added": "41",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Experimental Web Platform Features"
                  }
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            },
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              "version_added": "≤18"
            },
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              {
                "version_added": "39"
              },
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                "version_added": "34",
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                  {
                    "type": "preference",
                    "name": "dom.fetch.enabled"
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              {
                "version_added": "39"
              },
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                "version_added": "34",
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                  {
                    "type": "preference",
                    "name": "dom.fetch.enabled"
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            ],
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            },
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              {
                "version_added": "29"
              },
              {
                "version_added": "28",
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                    "name": "Experimental Web Platform Features"
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                    "name": "Experimental Web Platform Features"
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            },
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            },
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              "version_added": false
            }
          },
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            "experimental": true,
            "standard_track": true,
            "deprecated": true
          }
        }
      }
    }
  }
}