Baseline Widely available
The substringData() method of the CharacterData interface returns a portion of the existing data, starting at the specified index and extending for a given number of characters afterwards.
substringData(offset, count)
offset
The index of the first character to include in the returned substring. 0 is the first character of the string.
count
The number of characters to return.
A string with the substring.
ExceptionsIndexSizeError DOMException
Thrown if offset + count is larger than the length of the contained data.
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