code: def getElementsByClassName(self, className, root='root'):
          '''
              getElementsByClassName - Searches and returns all elements containing a given class name.
                 
                  @param className <str> - A one-word class name
                  @param root <AdvancedTag/'root'> - Search starting at a specific node, if provided. if string 'root' [default], the root of the parsed tree will be used.
          '''
          (root, isFromRoot) = self._handleRootArg(root)
  
          elements = []
  
          if isFromRoot is True and className in root.classNames:
              elements.append(root)
  
          getElementsByClassName = self.getElementsByClassName
          for child in root.children:
  
              if className in child.classNames:
                  elements.append(child)
  
              elements += getElementsByClassName(className, child)
  
          return TagCollection(elementsf getElementsByClassName(self, className, root='root'):
          '''
              getElementsByClassName - Searches and returns all elements containing a given class name.
                 
                  @param className <str> - A one-word class name
                  @param root <AdvancedTag/'root'> - Search starting at a specific node, if provided. if string 'root' [default], the root of the parsed tree will be used.
          '''
          (root, isFromRoot) = self._handleRootArg(root)
  
          elements = []
  
          if isFromRoot is True and className in root.classNames:
              elements.append(root)
  
          getElementsByClassName = self.getElementsByClassName
          for child in root.children:
  
              if className in child.classNames:
                  elements.append(child)
  
              elements += getElementsByClassName(className, child)
  
          return TagCollection(elements)
docs: getElementsByClassName - Searches and returns all elements containing a given class name.
                 
                  @param className <str> - A one-word class name
                  @param root <AdvancedTag/'root'> - Search starting at a specific node, if provided. if string 'root' [default], the root of the parsed tree will be used.