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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/DOMStringList/item below:

DOMStringList: item() method - Web APIs

DOMStringList: item() method

Baseline Widely available

Note: This feature is available in Web Workers.

The item() method returns a string from a DOMStringList by index.

Syntax

JavaScript also offers an array-like bracketed syntax for obtaining an item from a DOMStringList by index:

Parameters
index

the index of the string to get. The index is zero-based.

Return value

The string at the index position in the DOMStringList; otherwise null if the provided index is out of range.

Exceptions
TypeError

Thrown if no argument is provided.

Specifications Browser compatibility

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