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In this code :

document.getElementById()

Is document an object that has properties and methods?

If yes, is getElementById() a method on this object?

If no, What are document and getElementById considered?

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Yes, document is an object.

typeof document; // "object"

And getElementById is a property on that object.

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13 Comments

getElementById is an method of the Document prototype.
Yes, it is inherited via the prototype chain.
!!document.getElementById ==> true
@Kaiido 'getElementById' in document === true The function is still accessible from document, despite not being the direct owner.
@guest271314 document inherits from Document through [currentDocumentType]Document proto. So depending on what are the expectations of OP, it may do an difference.
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In browser, document is a instance of Document. document instanceof Document =>true.

It represents the whole HTML page. And document is a property of window. window.document === document => true.

So it can used as global object.

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