{
  "css": {
    "properties": {
      "align-items": {
        "flex_context": {
          "__compat": {
            "description": "Supported in Flex Layout",
            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/align-items",
            "support": {
              "chrome": [
                {
                  "version_added": "52"
                },
                {
                  "version_added": "29",
                  "partial_implementation": true,
                  "notes": "Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52."
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "21"
                }
              ],
              "chrome_android": [
                {
                  "version_added": "52"
                },
                {
                  "version_added": "29",
                  "partial_implementation": true,
                  "notes": "Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52."
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "25"
                }
              ],
              "edge": [
                {
                  "version_added": "12"
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "12"
                }
              ],
              "firefox": [
                {
                  "version_added": "20",
                  "notes": "Multi-line flexbox has been supported since Firefox 28."
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "49"
                },
                {
                  "version_removed": "20",
                  "version_added": "18",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "layout.css.flexbox.enabled",
                      "value_to_set": "true"
                    }
                  ]
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "48",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "layout.css.prefixes.webkit",
                      "value_to_set": "true"
                    }
                  ]
                }
              ],
              "firefox_android": [
                {
                  "version_added": "20",
                  "notes": "Multi-line flexbox has been supported since Firefox 28."
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "49"
                },
                {
                  "version_removed": "20",
                  "version_added": "18",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "layout.css.flexbox.enabled",
                      "value_to_set": "true"
                    }
                  ]
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "48",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "layout.css.prefixes.webkit",
                      "value_to_set": "true"
                    }
                  ]
                }
              ],
              "ie": {
                "version_added": "11",
                "notes": "In Internet Explorer 10 and 11, if column flex items have <code>align-items: center;</code> set on them and their content is too large, then they will overflow the bounds of their container. See <a href='https://github.com/philipwalton/flexbugs#2-column-flex-items-set-to-align-itemscenter-overflow-their-container'>Flexbug #2</a>."
              },
              "opera": {
                "version_added": "12.1"
              },
              "opera_android": {
                "version_added": "12.1"
              },
              "safari": [
                {
                  "version_added": "9"
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "7"
                }
              ],
              "safari_ios": [
                {
                  "version_added": "9"
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "7"
                }
              ],
              "samsunginternet_android": [
                {
                  "version_added": "6.0"
                },
                {
                  "version_added": "2.0",
                  "partial_implementation": true,
                  "notes": "Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Samsung Internet 6.0."
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "1.5"
                }
              ],
              "webview_android": [
                {
                  "version_added": "52"
                },
                {
                  "version_added": "4.4",
                  "partial_implementation": true,
                  "notes": "Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52."
                },
                {
                  "prefix": "-webkit-",
                  "version_added": "≤37"
                }
              ]
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          },
          "first_last_baseline": {
            "__compat": {
              "description": "<code>first baseline</code> and <code>last baseline</code>",
              "support": {
                "chrome": {
                  "version_added": "59"
                },
                "chrome_android": {
                  "version_added": "59"
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "version_added": "45"
                },
                "firefox_android": {
                  "version_added": "45"
                },
                "ie": {
                  "version_added": false
                },
                "opera": {
                  "version_added": "46"
                },
                "opera_android": {
                  "version_added": "43"
                },
                "safari": {
                  "version_added": "11"
                },
                "safari_ios": {
                  "version_added": "11"
                },
                "samsunginternet_android": {
                  "version_added": "7.0"
                },
                "webview_android": {
                  "version_added": "59"
                }
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
              }
            }
          },
          "left_right": {
            "__compat": {
              "description": "<code>left</code> and <code>right</code>",
              "support": {
                "chrome": {
                  "version_added": false
                },
                "chrome_android": {
                  "version_added": false
                },
                "edge": {
                  "version_added": false
                },
                "firefox": {
                  "version_added": "45"
                },
                "firefox_android": {
                  "version_added": "45"
                },
                "ie": {
                  "version_added": false
                },
                "opera": {
                  "version_added": false
                },
                "opera_android": {
                  "version_added": false
                },
                "safari": {
                  "version_added": "9"
                },
                "safari_ios": {
                  "version_added": "9"
                },
                "samsunginternet_android": {
                  "version_added": false
                },
                "webview_android": {
                  "version_added": false
                }
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
              }
            }
          },
          "safe_unsafe": {
            "__compat": {
              "description": "<code>safe</code> and <code>unsafe</code>",
              "support": {
                "chrome": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                },
                "chrome_android": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                },
                "edge": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                },
                "firefox": {
                  "version_added": "63"
                },
                "firefox_android": {
                  "version_added": "63"
                },
                "ie": {
                  "version_added": false
                },
                "opera": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                },
                "opera_android": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                },
                "safari": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                },
                "safari_ios": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                },
                "samsunginternet_android": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                },
                "webview_android": {
                  "version_added": false,
                  "notes": "This value is recognized, but has no effect."
                }
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
              }
            }
          },
          "start_end": {
            "__compat": {
              "description": "<code>start</code> and <code>end</code>",
              "support": {
                "chrome": {
                  "version_added": false
                },
                "chrome_android": {
                  "version_added": false
                },
                "edge": {
                  "version_added": false
                },
                "firefox": {
                  "version_added": "45"
                },
                "firefox_android": {
                  "version_added": "45"
                },
                "ie": {
                  "version_added": false
                },
                "opera": {
                  "version_added": "44"
                },
                "opera_android": {
                  "version_added": "43"
                },
                "safari": {
                  "version_added": false
                },
                "safari_ios": {
                  "version_added": false
                },
                "samsunginternet_android": {
                  "version_added": false
                },
                "webview_android": {
                  "version_added": false
                }
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
              }
            }
          }
        },
        "grid_context": {
          "__compat": {
            "description": "Supported in Grid Layout",
            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/align-items",
            "support": {
              "chrome": {
                "version_added": "57"
              },
              "chrome_android": {
                "version_added": "52"
              },
              "edge": {
                "version_added": "16"
              },
              "firefox": {
                "version_added": "52"
              },
              "firefox_android": {
                "version_added": "52"
              },
              "ie": {
                "version_added": false
              },
              "opera": {
                "version_added": "44"
              },
              "opera_android": {
                "version_added": "43"
              },
              "safari": {
                "version_added": "10.1"
              },
              "safari_ios": {
                "version_added": "10.3"
              },
              "samsunginternet_android": {
                "version_added": "6.2"
              },
              "webview_android": {
                "version_added": "57"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          },
          "start_end": {
            "__compat": {
              "description": "<code>start</code> and <code>end</code>",
              "support": {
                "chrome": {
                  "version_added": "57"
                },
                "chrome_android": {
                  "version_added": "57"
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "version_added": "52"
                },
                "firefox_android": {
                  "version_added": "52"
                },
                "ie": {
                  "version_added": false
                },
                "opera": {
                  "version_added": "44"
                },
                "opera_android": {
                  "version_added": "43"
                },
                "safari": {
                  "version_added": "11"
                },
                "safari_ios": {
                  "version_added": "11"
                },
                "samsunginternet_android": {
                  "version_added": "7.0"
                },
                "webview_android": {
                  "version_added": "57"
                }
              },
              "status": {
                "experimental": false,
                "standard_track": true,
                "deprecated": false
              }
            }
          }
        }
      }
    }
  }
}