diff --git a/Libraries/LibWeb/CSS/Keywords.json b/Libraries/LibWeb/CSS/Keywords.json
index abd75df14cf..6b2cd107a82 100644
--- a/Libraries/LibWeb/CSS/Keywords.json
+++ b/Libraries/LibWeb/CSS/Keywords.json
@@ -366,6 +366,7 @@
   "paused",
   "petite-caps",
   "pi",
+  "picture-in-picture",
   "pixelated",
   "plaintext",
   "plus-darker",
diff --git a/Libraries/LibWeb/CSS/MediaFeatures.json b/Libraries/LibWeb/CSS/MediaFeatures.json
index 6db18552b9c..2beaf64c05b 100644
--- a/Libraries/LibWeb/CSS/MediaFeatures.json
+++ b/Libraries/LibWeb/CSS/MediaFeatures.json
@@ -64,7 +64,8 @@
       "fullscreen",
       "standalone",
       "minimal-ui",
-      "browser"
+      "browser",
+      "picture-in-picture"
     ]
   },
   "dynamic-range": {
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/mediaqueries/display-mode.txt b/Tests/LibWeb/Text/expected/wpt-import/css/mediaqueries/display-mode.txt
index c6d1c03e499..d28fa0deb84 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/mediaqueries/display-mode.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/mediaqueries/display-mode.txt
@@ -2,14 +2,14 @@ Harness status: OK
 
 Found 17 tests
 
-11 Pass
-6 Fail
+12 Pass
+5 Fail
 Pass	Should be known: '(display-mode)'
 Pass	Should be known: '(display-mode: standalone)'
 Pass	Should be known: '(display-mode: browser)'
 Pass	Should be known: '(display-mode: minimal-ui)'
 Pass	Should be known: '(display-mode: fullscreen)'
-Fail	Should be known: '(display-mode: picture-in-picture)'
+Pass	Should be known: '(display-mode: picture-in-picture)'
 Fail	Should be parseable: '(display-mode: 0)'
 Pass	Should be unknown: '(display-mode: 0)'
 Fail	Should be parseable: '(display-mode: none)'