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The important thing is not to stop questioning. Curiosity has its own reason for existence. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery each day. Never lose a holy curiosity.

Albert Einstein

:indeterminate

The :indeterminate CSS pseudo-class represents any form element whose state is indeterminate, such as checkboxes which have their HTML indeterminate attribute set to true, radio buttons which are members of a group in which all radio buttons are unchecked, and indeterminate <progress> elements.
:indeterminate css reference