diff --git a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
index d5dadbd1f64..ab4c8c0e778 100644
--- a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
+++ b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
@@ -523,6 +523,8 @@ Parser::ParseErrorOr<NonnullRefPtr<CSSStyleValue const>> Parser::parse_css_value
             return parsed_value.release_nonnull();
         return ParseError::SyntaxError;
     case PropertyID::Border:
+    case PropertyID::BorderBlock:
+    case PropertyID::BorderInline:
         if (auto parsed_value = parse_border_value(property_id, tokens); parsed_value && !tokens.has_next_token())
             return parsed_value.release_nonnull();
         return ParseError::SyntaxError;
@@ -1597,6 +1599,17 @@ RefPtr<CSSStyleValue const> Parser::parse_border_value(PropertyID property_id, T
         style_property = PropertyID::BorderStyle;
         width_property = PropertyID::BorderWidth;
         break;
+    case PropertyID::BorderBlock:
+        color_property = PropertyID::BorderBlockColor;
+        style_property = PropertyID::BorderBlockStyle;
+        width_property = PropertyID::BorderBlockWidth;
+        break;
+    case PropertyID::BorderInline:
+        color_property = PropertyID::BorderInlineColor;
+        style_property = PropertyID::BorderInlineStyle;
+        width_property = PropertyID::BorderInlineWidth;
+        break;
+
     default:
         VERIFY_NOT_REACHED();
     }
diff --git a/Libraries/LibWeb/CSS/Properties.json b/Libraries/LibWeb/CSS/Properties.json
index f540c0f9352..99a7b9c82cc 100644
--- a/Libraries/LibWeb/CSS/Properties.json
+++ b/Libraries/LibWeb/CSS/Properties.json
@@ -497,6 +497,15 @@
       "border-color"
     ]
   },
+  "border-block": {
+    "inherited": false,
+    "initial": "medium currentcolor none",
+    "longhands": [
+      "border-block-width",
+      "border-block-style",
+      "border-block-color"
+    ]
+  },
   "border-block-color": {
     "inherited": false,
     "initial": "currentcolor",
@@ -778,6 +787,15 @@
       "auto"
     ]
   },
+  "border-inline": {
+    "inherited": false,
+    "initial": "medium currentcolor none",
+    "longhands": [
+      "border-inline-width",
+      "border-inline-style",
+      "border-inline-color"
+    ]
+  },
   "border-inline-color": {
     "inherited": false,
     "initial": "currentcolor",
diff --git a/Tests/LibWeb/Text/expected/css/CSSStyleProperties-all-supported-properties-and-default-values.txt b/Tests/LibWeb/Text/expected/css/CSSStyleProperties-all-supported-properties-and-default-values.txt
index 64842fd40af..e5756fc1604 100644
--- a/Tests/LibWeb/Text/expected/css/CSSStyleProperties-all-supported-properties-and-default-values.txt
+++ b/Tests/LibWeb/Text/expected/css/CSSStyleProperties-all-supported-properties-and-default-values.txt
@@ -201,6 +201,8 @@ All supported properties and their default values exposed from CSSStylePropertie
 'blockSize': '0px'
 'block-size': '0px'
 'border': '0px rgb(0, 0, 0)'
+'borderBlock': '0px rgb(0, 0, 0)'
+'border-block': '0px rgb(0, 0, 0)'
 'borderBlockColor': 'rgb(0, 0, 0)'
 'border-block-color': 'rgb(0, 0, 0)'
 'borderBlockEnd': '0px rgb(0, 0, 0)'
@@ -255,6 +257,8 @@ All supported properties and their default values exposed from CSSStylePropertie
 'border-image-source': 'none'
 'borderImageWidth': '1'
 'border-image-width': '1'
+'borderInline': '0px rgb(0, 0, 0)'
+'border-inline': '0px rgb(0, 0, 0)'
 'borderInlineColor': 'rgb(0, 0, 0)'
 'border-inline-color': 'rgb(0, 0, 0)'
 'borderInlineEnd': '0px rgb(0, 0, 0)'
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-logical/parsing/border-block-valid.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-logical/parsing/border-block-valid.txt
index d93ca08ee50..163a5aa0cf9 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/css-logical/parsing/border-block-valid.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-logical/parsing/border-block-valid.txt
@@ -2,10 +2,9 @@ Harness status: OK
 
 Found 6 tests
 
-4 Pass
-2 Fail
-Fail	e.style['border-block'] = "1px dotted red" should set the property value
-Fail	e.style['border-block'] = "double" should set the property value
+6 Pass
+Pass	e.style['border-block'] = "1px dotted red" should set the property value
+Pass	e.style['border-block'] = "double" should set the property value
 Pass	e.style['border-block-start'] = "green double thin" should set the property value
 Pass	e.style['border-block-start'] = "green" should set the property value
 Pass	e.style['border-block-end'] = "thin" should set the property value
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-logical/parsing/border-inline-valid.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-logical/parsing/border-inline-valid.txt
index cd2af1d9a2c..62ee55cd43e 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/css-logical/parsing/border-inline-valid.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-logical/parsing/border-inline-valid.txt
@@ -2,10 +2,9 @@ Harness status: OK
 
 Found 6 tests
 
-4 Pass
-2 Fail
-Fail	e.style['border-inline'] = "1px dotted red" should set the property value
-Fail	e.style['border-inline'] = "double" should set the property value
+6 Pass
+Pass	e.style['border-inline'] = "1px dotted red" should set the property value
+Pass	e.style['border-inline'] = "double" should set the property value
 Pass	e.style['border-inline-start'] = "green double thin" should set the property value
 Pass	e.style['border-inline-start'] = "green" should set the property value
 Pass	e.style['border-inline-end'] = "thin" should set the property value