{
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            "opera": {
              "version_added": "15"
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            "opera_android": {
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            "opera": {
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            "ie": {
              "version_added": "11",
              "notes": "Only works on Windows 8+."
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            "opera": {
              "version_added": "15"
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            "opera_android": {
              "version_added": "14"
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            "safari": {
              "version_added": "8"
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            "safari_ios": {
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            },
            "samsunginternet_android": {
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              {
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                    "type": "preference",
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              }
            ],
            "firefox_android": {
              "version_added": false
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            "ie": {
              "version_added": "11",
              "notes": "Only works on Windows 8+."
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            "opera": {
              "version_added": "15"
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            "opera_android": {
              "version_added": "14"
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            "safari_ios": {
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              {
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                "flags": [
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                    "type": "preference",
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              }
            ],
            "firefox_android": {
              "version_added": false
            },
            "ie": {
              "version_added": "11",
              "notes": "Only works on Windows 8+."
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            "opera": {
              "version_added": "15"
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            "opera_android": {
              "version_added": "14"
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            "safari": {
              "version_added": "8"
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            "safari_ios": {
              "version_added": false
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/SourceBuffer/onupdate",
          "support": {
            "chrome": {
              "version_added": "53"
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            "edge": {
              "version_added": "17"
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            "firefox": [
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              {
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                "flags": [
                  {
                    "type": "preference",
                    "name": "media.mediasource.enabled",
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            ],
            "firefox_android": {
              "version_added": false
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            "ie": {
              "version_added": "11",
              "notes": "Only works on Windows 8+."
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            "opera": {
              "version_added": "15"
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            "opera_android": {
              "version_added": "14"
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            "safari": {
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            "safari_ios": {
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      "onupdateend": {
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/SourceBuffer/onupdateend",
          "support": {
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            "edge": {
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              {
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                "flags": [
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                    "type": "preference",
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                ],
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              }
            ],
            "firefox_android": {
              "version_added": false
            },
            "ie": {
              "version_added": "11",
              "notes": "Only works on Windows 8+."
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            "opera": {
              "version_added": "15"
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            "opera_android": {
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      "onupdatestart": {
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            "edge": {
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              {
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                "flags": [
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                    "type": "preference",
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              }
            ],
            "firefox_android": {
              "version_added": false
            },
            "ie": {
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              "notes": "Only works on Windows 8+."
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              "version_added": "11",
              "notes": "Only works on Windows 8+."
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            "opera": {
              "version_added": "15"
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              "version_added": false
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              "version_added": false
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