diff --git a/css/selectors/-ms-browse.json b/css/selectors/-ms-browse.json
deleted file mode 100644
index af33032bcf0bd9..00000000000000
--- a/css/selectors/-ms-browse.json
+++ /dev/null
@@ -1,56 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-ms-browse": {
-        "__compat": {
-          "description": "<code>::-ms-browse</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-ms-browse",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": "12",
-              "version_removed": "79"
-            },
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": "10"
-            },
-            "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": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-ms-check.json b/css/selectors/-ms-check.json
deleted file mode 100644
index e1754c3fe2c825..00000000000000
--- a/css/selectors/-ms-check.json
+++ /dev/null
@@ -1,56 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-ms-check": {
-        "__compat": {
-          "description": "<code>::-ms-check</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-ms-check",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": "12",
-              "version_removed": "79"
-            },
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": "10"
-            },
-            "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": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-ms-clear.json b/css/selectors/-ms-clear.json
deleted file mode 100644
index 4b5fd4dd96de8e..00000000000000
--- a/css/selectors/-ms-clear.json
+++ /dev/null
@@ -1,58 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-ms-clear": {
-        "__compat": {
-          "description": "<code>::-ms-clear</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-ms-clear",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": "12",
-              "notes": "In an <code>&lt;input type='text'&gt;</code> element styled with <code>text-align: right</code>, if the clear button is shown, it will clip off the right edge of the text value of the <code>&lt;input type='text'&gt;</code> element. A workaround is to hide the clear button using <code>display: none</code>.",
-              "version_removed": "79"
-            },
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": "10",
-              "notes": "In an <code>&lt;input type='text'&gt;</code> element styled with <code>text-align: right</code>, if the clear button is shown, it will clip off the right edge of the text value of the <code>&lt;input type='text'&gt;</code> element. A workaround is to hide the clear button using <code>display: none</code>."
-            },
-            "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": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-ms-fill-lower.json b/css/selectors/-ms-fill-lower.json
deleted file mode 100644
index b2f6a9e6d00753..00000000000000
--- a/css/selectors/-ms-fill-lower.json
+++ /dev/null
@@ -1,56 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-ms-fill-lower": {
-        "__compat": {
-          "description": "<code>::-ms-fill-lower</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-ms-fill-lower",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": "12",
-              "version_removed": "79"
-            },
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": "10"
-            },
-            "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": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-ms-fill-upper.json b/css/selectors/-ms-fill-upper.json
deleted file mode 100644
index c4f3b32135c422..00000000000000
--- a/css/selectors/-ms-fill-upper.json
+++ /dev/null
@@ -1,56 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-ms-fill-upper": {
-        "__compat": {
-          "description": "<code>::-ms-fill-upper</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-ms-fill-upper",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": "12",
-              "version_removed": "79"
-            },
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": "10"
-            },
-            "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": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-ms-fill.json b/css/selectors/-ms-fill.json
deleted file mode 100644
index f09b832b4f8c02..00000000000000
--- a/css/selectors/-ms-fill.json
+++ /dev/null
@@ -1,56 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-ms-fill": {
-        "__compat": {
-          "description": "<code>::-ms-fill</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-ms-fill",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": "12",
-              "version_removed": "79"
-            },
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": "10"
-            },
-            "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": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-ms-reveal.json b/css/selectors/-ms-reveal.json
deleted file mode 100644
index 53843614cb457e..00000000000000
--- a/css/selectors/-ms-reveal.json
+++ /dev/null
@@ -1,56 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-ms-reveal": {
-        "__compat": {
-          "description": "<code>::-ms-reveal</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-ms-reveal",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": {
-              "version_added": "12",
-              "version_removed": "79"
-            },
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": "10"
-            },
-            "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": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-ms-value.json b/css/selectors/-ms-value.json
deleted file mode 100644
index fe455ca984ecca..00000000000000
--- a/css/selectors/-ms-value.json
+++ /dev/null
@@ -1,66 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-ms-value": {
-        "__compat": {
-          "description": "<code>::-ms-value</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-ms-value",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": {
-              "version_added": false
-            },
-            "edge": [
-              {
-                "version_added": "16",
-                "version_removed": "79"
-              },
-              {
-                "version_added": "12",
-                "version_removed": "16",
-                "partial_implementation": true,
-                "notes": "Edge 12-15 do not render the <code>color</code> property on <code>&lt;input&gt;</code> elements with a pre-filled <code>value</code> until the user selects a range of text or changes the input's value."
-              }
-            ],
-            "firefox": {
-              "version_added": false
-            },
-            "firefox_android": {
-              "version_added": false
-            },
-            "ie": {
-              "version_added": "10",
-              "partial_implementation": true,
-              "notes": "IE 10-11 do not render the <code>color</code> property on <code>&lt;input&gt;</code> elements with a pre-filled <code>value</code> until the user selects a range of text or changes the input's value."
-            },
-            "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": false
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}