DOMCharacterData::substringData Extracts a range of data from the character data &reftitle.description; public stringfalseDOMCharacterData::substringData intoffset intcount Returns the specified substring. &reftitle.parameters; offset Start offset of substring to extract. count The number of characters to extract. &reftitle.returnvalues; The specified substring. If the sum of offset and count exceeds the length, then all UTF-8 codepoints to the end of the data are returned. &reftitle.errors; May throw a DOMException with the following error codes: DOM_INDEX_SIZE_ERR Raised if offset is negative or greater than the number of UTF-8 codepoints in data, or if count is negative. &reftitle.seealso; DOMCharacterData::appendData DOMCharacterData::deleteData DOMCharacterData::insertData DOMCharacterData::replaceData