Shameless copy and paste from Wikipedia: Some applications use checkboxes that allow an indeterminate state in addition to the two provided ... ... <看更多>

當有全選功能的checkbox時，若只有部分選項被選取了，既不是全選也不是全不選，那就給它個不明確選取狀態「indeterminate」吧， ... ... <看更多>

Android CheckBox and RadioButton with additional 3rd 'indeterminate' state. Requirements. Based on AppCompat library; Requires AppCompat theme; API 7+ (but ... ... <看更多>

I would suggest going with option B. The reason for this is that it is being used as a filter and the most likely reason for the user ... ... <看更多>

CSS :indeterminate Checkbox selector ... The pseudo-class :indeterminate selector Users can set checked and ... ... <看更多>

indeterminate. boolean. false. Indeterminism is purely presentational - the value of a checkbox and its indeterminism are independent. ... <看更多>

Android CheckBox and RadioButton with additional 3rd "indeterminate" state. License, Apache 2.0. Categories, Android Packages. Tags, githubandroid ... ... <看更多>

And, for whatever reason, you make that checkbox indeterminate: let veg = document.querySelector(".veg"); veg.indeterminate = true;. If you serialize that form ... ... <看更多>