feat: improve real-time chart example; add small refinements to via core files

h/h.go

@@ -11,6 +11,7 @@ package h
 
 import (
 	"io"
+
 	g "maragu.dev/gomponents"
 	gc "maragu.dev/gomponents/components"
 )
@@ -50,6 +51,13 @@ func Attr(name string, value ...string) H {
 	return g.Attr(name, value...)
 }
 
+func If(condition bool, n H) H {
+	if condition {
+		return n
+	}
+	return nil
+}
+
 // HTML5Props defines properties for HTML5 pages. Title is set always set, Description
 // and Language elements only if the strings are non-empty.
 type HTML5Props struct {