I'm writing this due to I had a use case come up for this state: nested checkboxes.checkbox may have child checkboxes. If all those children are checked, it may be checked. If none are checked, it is unchecked. If some of them are checked, then it's in an partially checked state (inderterminate state). Partially checked state of checkbox (indeterminate state): ==> Fully checked state of checkbox: ==> Download Code