{
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        "__compat": {
          "description": "<code>::marker</code>",
          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::marker",
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              },
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                  {
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                  {
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              },
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                "flags": [
                  {
                    "type": "preference",
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                  }
                ]
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            },
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            }
          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "animation_and_transition_support": {
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            "description": "Animation and transition support",
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                {
                  "version_added": "86"
                },
                {
                  "version_added": "83",
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                    {
                      "type": "preference",
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                    }
                  ]
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                },
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                    {
                      "type": "preference",
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                  ]
                }
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                {
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                },
                {
                  "version_added": "83",
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                    {
                      "type": "preference",
                      "name": "Enable experimental Web Platform features"
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                  ]
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              ],
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                "version_added": "80"
              },
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                "version_added": false
              },
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              },
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              },
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              },
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              },
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              },
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            },
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      }
    }
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}