What is containership?

What is containership?

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Containership can also be called containment hierarchy. In the JavaScript object hierarchy, the window object is at the topmost level. Hence, the reference to this object is usually omitted.

For example:

document.write() can also be used as window.document.write().

Objects such as document, location, etc., are child objects of the window object. Since the window object is at the topmost level, it is not necessary for the child objects to refer to the window object. Some objects such as buttons are form elements. Without referencing the form object, the form elements will not work.

For example:

document.form_name.element_name

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