HTMLInputElement checkbox indeterminate

Properties that apply only to elements of type checkbox or radio
checked Boolean: Returns / Sets the current state of the element when type is checkbox or radio.
defaultChecked Boolean: Returns / Sets the default state of a radio button or checkbox as originally specified in HTML that created this object.
indeterminate Boolean: Returns whether the checkbox or radio button is in indeterminate state. For checkboxes, the effect is that the appearance of the checkbox is obscured/greyed in some way as to indicate its state is indeterminate (not checked but not unchecked). Does not affect the value of the checked attribute, and clicking the checkbox will set the value to false.

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