feat(css): Update syntax for margin-* (#984)

Author: skyclouds2001

css/properties.json

@@ -6680,12 +6680,13 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/margin-block-start"
   },
   "margin-bottom": {
-    "syntax": "<length-percentage> | auto",
+    "syntax": "<length-percentage> | auto | <anchor-size()>",
     "media": "visual",
     "inherited": false,
     "animationType": "length",
     "percentages": "referToWidthOfContainingBlock",
     "groups": [
+      "CSS Anchor Positioning",
       "CSS Box Model"
     ],
     "initial": "0",
@@ -6753,12 +6754,13 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/margin-inline-start"
   },
   "margin-left": {
-    "syntax": "<length-percentage> | auto",
+    "syntax": "<length-percentage> | auto | <anchor-size()>",
     "media": "visual",
     "inherited": false,
     "animationType": "length",
     "percentages": "referToWidthOfContainingBlock",
     "groups": [
+      "CSS Anchor Positioning",
       "CSS Box Model"
     ],
     "initial": "0",
@@ -6772,12 +6774,13 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/margin-left"
   },
   "margin-right": {
-    "syntax": "<length-percentage> | auto",
+    "syntax": "<length-percentage> | auto | <anchor-size()>",
     "media": "visual",
     "inherited": false,
     "animationType": "length",
     "percentages": "referToWidthOfContainingBlock",
     "groups": [
+      "CSS Anchor Positioning",
       "CSS Box Model"
     ],
     "initial": "0",
@@ -6791,12 +6794,13 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/margin-right"
   },
   "margin-top": {
-    "syntax": "<length-percentage> | auto",
+    "syntax": "<length-percentage> | auto | <anchor-size()>",
     "media": "visual",
     "inherited": false,
     "animationType": "length",
     "percentages": "referToWidthOfContainingBlock",
     "groups": [
+      "CSS Anchor Positioning",
       "CSS Box Model"
     ],
     "initial": "0",