Append the string to the end of the character data of the node.

  Append the string to the end of the character data of the node. Upon
success, data provides access to the concatenation of
data and the DOMString specified.
Parameters:
- arg - The DOMString to append.
Throws:
- DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

  Remove a range of 16-bit units from the node.

  Remove a range of 16-bit units from the node. Upon success,
data and length reflect the change.
Parameters:
- offset - The offset from which to start removing.
- count - The number of 16-bit units to delete. If the sum of offset and count exceeds length then all 16-bit units from offset to the end of the data are deleted.
Throws:
- DOMException - INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of 16-bit units in data, or if the specified count is negative.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

  The character data of the node that implements this interface.

  The character data of the node that implements this interface. The DOM
implementation may not put arbitrary limits on the amount of data
that may be stored in a CharacterData node. However,
implementation limits may mean that the entirety of a node's data may
not fit into a single DOMString. In such cases, the user
may call substringData to retrieve the data in
appropriately sized pieces.
Throws:
- DOMException - DOMSTRING_SIZE_ERR: Raised when it would return more characters than fit in a DOMString variable on the implementation platform.

  The number of 16-bit units that are available through data and the substringData method below.

  The number of 16-bit units that are available through data
and the substringData method below. This may have the
value zero, i.e., CharacterData nodes may be empty.

  Insert a string at the specified 16-bit unit offset.

  Insert a string at the specified 16-bit unit offset.
Parameters:
- offset - The character offset at which to insert.
- arg - The DOMString to insert.
Throws:
- DOMException - INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of 16-bit units in data.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

  Replace the characters starting at the specified 16-bit unit offset with the specified string.

  Replace the characters starting at the specified 16-bit unit offset
with the specified string.
Parameters:
- offset - The offset from which to start replacing.
- count - The number of 16-bit units to replace. If the sum of offset and count exceeds length, then all 16-bit units to the end of the data are replaced; (i.e., the effect is the same as a remove method call with the same range, followed by an append method invocation).
- arg - The DOMString with which the range must be replaced.
Throws:
- DOMException - INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of 16-bit units in data, or if the specified count is negative.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

  The character data of the node that implements this interface.

  The character data of the node that implements this interface. The DOM
implementation may not put arbitrary limits on the amount of data
that may be stored in a CharacterData node. However,
implementation limits may mean that the entirety of a node's data may
not fit into a single DOMString. In such cases, the user
may call substringData to retrieve the data in
appropriately sized pieces.
Throws:
- DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.

  Extracts a range of data from the node.

  Extracts a range of data from the node.
Returns: The specified substring. If the sum of offset and count exceeds the length, then all 16-bit units to the end of the data are returned.
Parameters:
- offset - Start offset of substring to extract.
- count - The number of 16-bit units to extract.
Throws:
- DOMException - INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of 16-bit units in data, or if the specified count is negative.
DOMSTRING_SIZE_ERR: Raised if the specified range of text does not fit into a DOMString.