{
  "css": {
    "properties": {
      "font-size": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/font-size",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "5.5"
            },
            "opera": {
              "version_added": "7"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "rem_values": {
          "__compat": {
            "description": "<code>rem</code> values",
            "support": {
              "chrome": {
                "version_added": "31"
              },
              "chrome_android": {
                "version_added": "42"
              },
              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "31",
                "notes": [
                  "Before Firefox 57, animations using em units are not affected by changes to the <code>font-size</code> of the animated element's parent (<a href='https://bugzil.la/1254424'>bug 1254424</a>).",
                  "Before Firefox 57, some language settings' inherited <code>font-size</code> is smaller than expected (<a href='https://bugzil.la/1391341'>bug 1391341</a>)."
                ]
              },
              "firefox_android": {
                "version_added": "31"
              },
              "ie": [
                {
                  "version_added": "11"
                },
                {
                  "partial_implementation": true,
                  "version_added": "9",
                  "version_removed": "10"
                }
              ],
              "opera": {
                "version_added": "28"
              },
              "opera_android": {
                "version_added": "28"
              },
              "safari": {
                "version_added": "7"
              },
              "safari_ios": {
                "version_added": "7"
              },
              "samsunginternet_android": {
                "version_added": "4.0"
              },
              "webview_android": {
                "version_added": "4.1"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "xxx-large": {
          "__compat": {
            "description": "<code>xxx-large</code> keyword",
            "support": {
              "chrome": {
                "version_added": "79"
              },
              "chrome_android": {
                "version_added": "79"
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "70"
              },
              "firefox_android": {
                "version_added": false
              },
              "ie": {
                "version_added": false
              },
              "opera": {
                "version_added": false
              },
              "opera_android": {
                "version_added": false
              },
              "safari": {
                "version_added": false
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": "79"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      }
    }
  }
}