Instanciate common attributes everywhere so one can simply use the extend method

xhtmlText.go

@@ -16,8 +16,9 @@ func (x *XHTMLText) isText() bool { return true }
 // newPlainText creates a new PlainText. It returns a *PlainText.
 func newXHTMLText(textType, content string) *XHTMLText {
 	return &XHTMLText{
-		Type:     textType,
-		XHTMLDiv: NewXHTMLDiv(content),
+		CommonAttributes: newCommonAttributes(),
+		Type:             textType,
+		XHTMLDiv:         NewXHTMLDiv(content),
 	}
 }