diff --git a/css/functions.json b/css/functions.json
index 3ec05751..09c9ce30 100644
--- a/css/functions.json
+++ b/css/functions.json
@@ -1,6 +1,6 @@
 {
   "anchor()": {
-    "syntax": "anchor( <anchor-element>? <anchor-side>, <length-percentage>? )",
+    "syntax": "anchor( <anchor-name>? && <anchor-side>, <length-percentage>? )",
     "groups": [
       "CSS Positioning"
     ],
@@ -8,7 +8,7 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/anchor"
   },
   "anchor-size()": {
-    "syntax": "anchor-size( <anchor-element>? <anchor-size>, <length-percentage>? )",
+    "syntax": "anchor-size( [ <anchor-name> || <anchor-size> ]? , <length-percentage>? )",
     "groups": [
       "CSS Positioning"
     ],
diff --git a/css/properties.json b/css/properties.json
index b3661913..2afa596d 100644
--- a/css/properties.json
+++ b/css/properties.json
@@ -8420,7 +8420,7 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/position"
   },
   "position-anchor": {
-    "syntax": "<anchor-element>",
+    "syntax": "auto | <anchor-name>",
     "media": "visual",
     "inherited": false,
     "animationType": "discrete",
@@ -8428,7 +8428,7 @@
     "groups": [
       "CSS Positioning"
     ],
-    "initial": "implicit",
+    "initial": "auto",
     "appliesto": "absolutelyPositionedElements",
     "computed": "asSpecified",
     "order": "perGrammar",
@@ -8443,7 +8443,10 @@
       "position-try-fallbacks",
       "position-try-order"
     ],
-    "percentages": "no",
+    "percentages": [
+      "position-try-fallbacks",
+      "position-try-order"
+    ],
     "groups": [
       "CSS Positioning"
     ],