No DOM objects directly implement this interface -- it is extended by Text (and others).
data contains the data represented by this Node. (If there is a platform restriction on the length of String, then the substringData must be used to retrieve data in appropriately sized chunks.)
Exception:
length records the size (in character units) of data.
Same as replaceData(this.length, 0, arg) but won't raise INDEX_SIZE_ERR (obviously).
Same as replaceData(offset, count, "").
Same as replaceData(offset, 0, arg).
count character units, starting offset character units from the start of the string (i.e. zero-based), are deleted. arg is then inserted into the string at offset.
NOTE: This is how I understand the W3C specification. Other interpretations could affect all the above *Data methods. I've not yet written any code that uses this, so I don't know whether I'm right or not. Please /msg me if you know!
Exceptions:
Returns a String containing count character units from data, starting offset character units from the start.
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