Skeleton for border property help

sandbox/uber.css

@@ -10,6 +10,8 @@
   height: 8;
 
   min-width: 80;
-  background: dark_blu;
-  padding: 2x;
+  background: dark_blue;
+  padding: 2;
+  border-top: solid red ;
+  border-left: solid red ;
 }

sandbox/uber.py

@@ -88,6 +88,7 @@ class BasicApp(App):
         # new_margin = old_margin + (1,1,1)
         # self.focused.styles.padding = (1, 1, 1)
         self.focused.styles.color = "banana"
+        self.focused.styles.border
 
 
 BasicApp.run(css_file="uber.css", log="textual.log", log_verbosity=1)

src/textual/css/_help_text.py

@@ -251,4 +251,8 @@ def color_property_help_text(
 def border_property_help_text(
     property_name: str, context: StylingContext | None
 ) -> HelpText:
-    pass
+    property_name = _contextualize_property_name(property_name, context)
+    return HelpText(
+        summary=f"Invalid value for [i]{property_name}[/] property",
+        bullets=[*ContextSpecificBullets(inline=[Bullet("")]).get_by_context(context)],
+    )