removeAttribute method 
    
      
  
void
removeAttribute(
 - String qualifiedName
) 
    
    
  Implementation
  @mustCallSuper
void removeAttribute(String qualifiedName) {
  ElementAttributeProperty? propertyHandler = _attributeProperties[qualifiedName];
  if (propertyHandler != null && propertyHandler.deleter != null) {
    propertyHandler.deleter!();
  }
  if (hasAttribute(qualifiedName)) {
    attributes.remove(qualifiedName);
    final isNeedRecalculate = _checkRecalculateStyle([qualifiedName]);
    recalculateStyle(rebuildNested: isNeedRecalculate);
  }
}