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                  "version_added": "58"
                },
                "chrome_android": "mirror",
                "deno": [
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                  {
                    "version_added": "1.0",
                    "version_removed": "1.8",
                    "partial_implementation": true,
                    "notes": "Only the locale data for `en-US` is available."
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                ],
                "edge": {
                  "version_added": "12"
                },
                "firefox": {
                  "version_added": "55"
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                "firefox_android": "mirror",
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                "opera": "mirror",
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                "safari": {
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                "samsunginternet_android": "mirror",
                "webview_android": "mirror",
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                "standard_track": true,
                "deprecated": false
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            "tags": [
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              "chrome": {
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              "chrome_android": "mirror",
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              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
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              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
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          },
          "locales_parameter": {
            "__compat": {
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              "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/toLocaleUpperCase#locales",
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                "safari": {
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                "safari_ios": "mirror",
                "samsunginternet_android": "mirror",
                "webview_android": "mirror",
                "webview_ios": "mirror"
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
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            }
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              "chrome": {
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              "safari": {
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              "samsunginternet_android": "mirror",
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              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
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          }
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            },
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              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
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          }
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            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/toWellFormed",
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              "standard_track": true,
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          }
        },
        "unicode_code_point_escapes": {
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              "standard_track": true,
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        "@@iterator": {
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