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Expando

Expando properties are properties added to DOM nodes with JavaScript , where those properties are not part of the object's DOM specification:

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Expando

js 
                                    
                                        window.
                                        document.
                                        foo =
                                        5
                                        ;
                                        // foo is an expando

The term may also be applied to properties added to objects without respecting the object's original intent, such as non-numeric named properties added to an Array .

Updated on April 20, 2024 by Datarist.