2.1.2 [DOM Level 2 - HTML] Section 1.4, Misc Object Definitions

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V0025:

The specification states:

interface HTMLOptionsCollection
namedItem 
This method retrieves a Node using a name. It first searches for a Node with a 
matching id attribute. If it doesn't find one, it then searches for a Node with a 
matching name attribute, but only on those elements that are allowed a name 
attribute. This method is case insensitive in HTML documents and case sensitive in 
XHTML documents. 
 
Parameters 
name of type DOMString 
The name of the Node to be fetched.
 
Return Value 
Node
The Node with a name or id attribute whose value corresponds to the specified 
string. Upon failure (e.g., no node with this name exists), returns null.
 
No Exceptions

Quirks Mode, IE7 Mode, and IE8 Mode (All Versions)

XHTML documents are not supported by the namedItem method of the HTMLOptionsCollection interface.

IE9 Mode (All Versions)

The namedItem method of the HTMLOptionsCollection interface is not case-sensitive.