This pseudo-class is called the indeterminate-value pseudo-class which represents the indeterminate state of radio or checkbox elements. This state is set if the checkbox/radio is neither checked nor unchecked, basically a no pre-selected choice. Another indeterminate state would be an unknown progress meter completion.
/* declarations */
The above mentioned example would decrease the
opacity of not pre-selected choice elements down to
# Browser support
Platform Chrome Firefox Safari Edge Internet Explorer Opera
Desktop Yes (15.0) Yes (4.0) Yes (5.1) Yes (12.0) Yes (9.0) Yes (12.1)
Mobile Yes (59) Yes (1) Yes (7.1) Yes (12.0) Yes (10.0) Yes (12.1)
For future browser support information, also check out caniuse.com (Indeterminate-value pseudo-class).
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