diff --git a/css/at-rules/viewport.json b/css/at-rules/viewport.json
deleted file mode 100644
index a623d60f78b76..0000000000000
--- a/css/at-rules/viewport.json
+++ /dev/null
@@ -1,80 +0,0 @@
-{
-  "css": {
-    "at-rules": {
-      "viewport": {
-        "__compat": {
-          "description": "<code>@viewport</code>",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@viewport",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": "mirror",
-            "edge": {
-              "prefix": "-ms-",
-              "version_added": "12",
-              "flags": [
-                {
-                  "type": "preference",
-                  "name": "Enable @-ms-viewport rules"
-                }
-              ]
-            },
-            "firefox": {
-              "version_added": false,
-              "notes": "See Firefox <a href='https://bugzil.la/747754'>bug 747754</a>."
-            },
-            "firefox_android": "mirror",
-            "ie": {
-              "prefix": "-ms-",
-              "version_added": "10"
-            },
-            "oculus": "mirror",
-            "opera": [
-              {
-                "version_added": "16",
-                "flags": [
-                  {
-                    "type": "runtime_flag",
-                    "name": "--enable-experimental-webkit-features"
-                  },
-                  {
-                    "type": "runtime_flag",
-                    "name": "--enable-viewport"
-                  }
-                ]
-              },
-              {
-                "prefix": "-o-",
-                "version_added": "11.1",
-                "version_removed": "15"
-              }
-            ],
-            "opera_android": {
-              "prefix": "-o-",
-              "version_added": "11.1",
-              "version_removed": "14"
-            },
-            "safari": {
-              "version_added": false,
-              "notes": "See WebKit <a href='https://webkit.org/b/95959'>bug 95959</a>."
-            },
-            "safari_ios": "mirror",
-            "samsunginternet_android": {
-              "version_added": "2.0"
-            },
-            "webview_android": {
-              "version_removed": "37",
-              "version_added": "4.4"
-            }
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        }
-      }
-    }
-  }
-}