Remove a range of characters from the node. Upon success,
length reflect the change.
|offset ||The offset from which to remove characters. |
|count ||The number of characters to delete. If the sum of |
length then all characters from
offset to the end of the data are deleted.
|DOMException ||INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of characters in |
data, or if the specified
count is negative.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.