diff --git a/api/Navigation.json b/api/Navigation.json
index 86ee1a86ecbb9f..c0455a7e4d0e5b 100644
--- a/api/Navigation.json
+++ b/api/Navigation.json
@@ -33,6 +33,42 @@
           "deprecated": false
         }
       },
+      "activation": {
+        "__compat": {
+          "spec_url": "https://html.spec.whatwg.org/multipage/nav-history-apis.html#dom-navigation-activation",
+          "tags": [
+            "web-features:navigation-activation"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
       "back": {
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/Navigation/back",
diff --git a/api/NavigationActivation.json b/api/NavigationActivation.json
new file mode 100644
index 00000000000000..9dfc4bf3ab7268
--- /dev/null
+++ b/api/NavigationActivation.json
@@ -0,0 +1,148 @@
+{
+  "api": {
+    "NavigationActivation": {
+      "__compat": {
+        "spec_url": "https://html.spec.whatwg.org/multipage/nav-history-apis.html#navigationactivation",
+        "tags": [
+          "web-features:navigation-activation"
+        ],
+        "support": {
+          "chrome": {
+            "version_added": "123"
+          },
+          "chrome_android": "mirror",
+          "edge": "mirror",
+          "firefox": {
+            "version_added": false
+          },
+          "firefox_android": "mirror",
+          "ie": {
+            "version_added": false
+          },
+          "oculus": "mirror",
+          "opera": "mirror",
+          "opera_android": "mirror",
+          "safari": {
+            "version_added": false
+          },
+          "safari_ios": "mirror",
+          "samsunginternet_android": "mirror",
+          "webview_android": "mirror"
+        },
+        "status": {
+          "experimental": true,
+          "standard_track": true,
+          "deprecated": false
+        }
+      },
+      "entry": {
+        "__compat": {
+          "spec_url": "https://html.spec.whatwg.org/multipage/nav-history-apis.html#dom-navigationactivation-entry",
+          "tags": [
+            "web-features:navigation-activation"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "from": {
+        "__compat": {
+          "spec_url": "https://html.spec.whatwg.org/multipage/nav-history-apis.html#dom-navigationactivation-from",
+          "tags": [
+            "web-features:navigation-activation"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "navigationType": {
+        "__compat": {
+          "spec_url": "https://html.spec.whatwg.org/multipage/nav-history-apis.html#dom-navigationactivation-navigationtype",
+          "tags": [
+            "web-features:navigation-activation"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/api/PageRevealEvent.json b/api/PageRevealEvent.json
new file mode 100644
index 00000000000000..2222f7d4554f45
--- /dev/null
+++ b/api/PageRevealEvent.json
@@ -0,0 +1,37 @@
+{
+  "api": {
+    "PageRevealEvent": {
+      "__compat": {
+        "spec_url": "https://html.spec.whatwg.org/multipage/nav-history-apis.html#the-pagerevealevent-interface",
+        "support": {
+          "chrome": {
+            "version_added": "123"
+          },
+          "chrome_android": "mirror",
+          "edge": "mirror",
+          "firefox": {
+            "version_added": false
+          },
+          "firefox_android": "mirror",
+          "ie": {
+            "version_added": false
+          },
+          "oculus": "mirror",
+          "opera": "mirror",
+          "opera_android": "mirror",
+          "safari": {
+            "version_added": false
+          },
+          "safari_ios": "mirror",
+          "samsunginternet_android": "mirror",
+          "webview_android": "mirror"
+        },
+        "status": {
+          "experimental": true,
+          "standard_track": true,
+          "deprecated": false
+        }
+      }
+    }
+  }
+}
diff --git a/api/PerformanceLongAnimationFrameTiming.json b/api/PerformanceLongAnimationFrameTiming.json
new file mode 100644
index 00000000000000..93c029b0cdc20d
--- /dev/null
+++ b/api/PerformanceLongAnimationFrameTiming.json
@@ -0,0 +1,256 @@
+{
+  "api": {
+    "PerformanceLongAnimationFrameTiming": {
+      "__compat": {
+        "spec_url": "https://w3c.github.io/longtasks/#sec-PerformanceLongAnimationFrameTiming",
+        "tags": [
+          "web-features:long-animation-frame-timing"
+        ],
+        "support": {
+          "chrome": {
+            "version_added": "123"
+          },
+          "chrome_android": "mirror",
+          "edge": "mirror",
+          "firefox": {
+            "version_added": false
+          },
+          "firefox_android": "mirror",
+          "ie": {
+            "version_added": false
+          },
+          "oculus": "mirror",
+          "opera": "mirror",
+          "opera_android": "mirror",
+          "safari": {
+            "version_added": false
+          },
+          "safari_ios": "mirror",
+          "samsunginternet_android": "mirror",
+          "webview_android": "mirror"
+        },
+        "status": {
+          "experimental": true,
+          "standard_track": true,
+          "deprecated": false
+        }
+      },
+      "blockingDuration": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancelonganimationframetiming-blockingduration",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "firstUIEventTimestamp": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancelonganimationframetiming-firstuieventtimestamp",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "renderStart": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancelonganimationframetiming-renderstart",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "scripts": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancelonganimationframetiming-scripts",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "styleAndLayoutStart": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancelonganimationframetiming-styleandlayoutstart",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "toJSON": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancelonganimationframetiming-tojson",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/api/PerformanceScriptTiming.json b/api/PerformanceScriptTiming.json
new file mode 100644
index 00000000000000..8487c55235e2e1
--- /dev/null
+++ b/api/PerformanceScriptTiming.json
@@ -0,0 +1,328 @@
+{
+  "api": {
+    "PerformanceScriptTiming": {
+      "__compat": {
+        "spec_url": "https://w3c.github.io/longtasks/#performancescripttiming",
+        "tags": [
+          "web-features:long-animation-frame-timing"
+        ],
+        "support": {
+          "chrome": {
+            "version_added": "123"
+          },
+          "chrome_android": "mirror",
+          "edge": "mirror",
+          "firefox": {
+            "version_added": false
+          },
+          "firefox_android": "mirror",
+          "ie": {
+            "version_added": false
+          },
+          "oculus": "mirror",
+          "opera": "mirror",
+          "opera_android": "mirror",
+          "safari": {
+            "version_added": false
+          },
+          "safari_ios": "mirror",
+          "samsunginternet_android": "mirror",
+          "webview_android": "mirror"
+        },
+        "status": {
+          "experimental": true,
+          "standard_track": true,
+          "deprecated": false
+        }
+      },
+      "executionStart": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancescripttiming-executionstart",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "forcedStyleAndLayoutDuration": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancescripttiming-forcedstyleandlayoutduration",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "invoker": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancescripttiming-invoker",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "invokerType": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancescripttiming-invokertype",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "pauseDuration": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancescripttiming-pauseduration",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "toJSON": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancescripttiming-tojson",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "window": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancescripttiming-window",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
+      "windowAttribution": {
+        "__compat": {
+          "spec_url": "https://w3c.github.io/longtasks/#dom-performancescripttiming-windowattribution",
+          "tags": [
+            "web-features:long-animation-frame-timing"
+          ],
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/css/properties/field-sizing.json b/css/properties/field-sizing.json
new file mode 100644
index 00000000000000..97f2d92c787659
--- /dev/null
+++ b/css/properties/field-sizing.json
@@ -0,0 +1,105 @@
+{
+  "css": {
+    "properties": {
+      "field-sizing": {
+        "__compat": {
+          "spec_url": "https://drafts.csswg.org/css-ui/#field-sizing",
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        },
+        "content": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-ui/#valdef-field-sizing-content",
+            "support": {
+              "chrome": {
+                "version_added": "123"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "fixed": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-ui/#valdef-field-sizing-fixed",
+            "support": {
+              "chrome": {
+                "version_added": "123"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/css/properties/text-spacing-trim.json b/css/properties/text-spacing-trim.json
new file mode 100644
index 00000000000000..e48b7d6d4e5666
--- /dev/null
+++ b/css/properties/text-spacing-trim.json
@@ -0,0 +1,171 @@
+{
+  "css": {
+    "properties": {
+      "text-spacing-trim": {
+        "__compat": {
+          "spec_url": "https://drafts.csswg.org/css-text-4/#text-spacing-trim-property",
+          "support": {
+            "chrome": {
+              "version_added": "123"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": "mirror",
+            "ie": {
+              "version_added": false
+            },
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror"
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        },
+        "normal": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-text-4/#valdef-text-spacing-trim-normal",
+            "support": {
+              "chrome": {
+                "version_added": "123"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "space-all": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-text-4/#valdef-text-spacing-trim-space-all",
+            "support": {
+              "chrome": {
+                "version_added": "123"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "space-first": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-text-4/#valdef-text-spacing-trim-space-first",
+            "support": {
+              "chrome": {
+                "version_added": "123"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "trim-start": {
+          "__compat": {
+            "spec_url": "https://drafts.csswg.org/css-text-4/#valdef-text-spacing-trim-trim-start",
+            "support": {
+              "chrome": {
+                "version_added": "123"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        }
+      }
+    }
+  }
+}