add
Adds an element to the property value.
Contrary to append, if this property has no value, this operation has no effect on the value of this property.
Parameters
element
The element
See also
for a more convenient
Adds an element to the property value.
The given provider will be queried when the value of this property is queried.
Contrary to append, if this property has no value, this operation has no effect on the value of this property.
Also contrary to append, this property will have no value when the given provider has no value.
Parameters
provider
The provider of an element