LibWeb: Parse display: inline-flex

This was already handled in the CSS machinery, we just never parsed it.

Userland/Libraries/LibWeb/CSS/Identifiers.json

@@ -116,6 +116,7 @@
   "hidden",
   "inline",
   "inline-block",
+  "inline-flex",
   "inline-table",
   "inset",
   "inside",

Userland/Libraries/LibWeb/CSS/Properties.json

@@ -571,6 +571,7 @@
       "flex",
       "inline",
       "inline-block",
+      "inline-flex",
       "inline-table",
       "list-item",
       "none",

Userland/Libraries/LibWeb/CSS/StyleProperties.cpp

@@ -631,6 +631,8 @@ CSS::Display StyleProperties::display() const
         return CSS::Display { CSS::Display::Internal::TableFooterGroup };
     case CSS::ValueID::Flex:
         return CSS::Display::from_short(CSS::Display::Short::Flex);
+    case CSS::ValueID::InlineFlex:
+        return CSS::Display::from_short(CSS::Display::Short::InlineFlex);
     default:
         return CSS::Display::from_short(CSS::Display::Short::Block);
     }