LibWeb: Add support for the inline-size CSS property

Author: https://github.com/implicitfield
Commit: 18fe86adc3
Pull-request: https://github.com/SerenityOS/serenity/pull/23509

Userland/Libraries/LibWeb/CSS/StyleComputer.cpp

@@ -375,6 +375,8 @@ void StyleComputer::for_each_property_expanding_shorthands(PropertyID property_i
             return PropertyID::PaddingLeft;
         case PropertyID::PaddingInlineEnd:
             return PropertyID::PaddingRight;
+        case PropertyID::InlineSize:
+            return PropertyID::Width;
         case PropertyID::InsetBlockStart:
             return PropertyID::Top;
         case PropertyID::InsetBlockEnd: