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Since indeterminate checkboxes aren't available natively on the web, I've historically supported this by preventing users from collapsing subtrees with some (but not all) children selected. We also added a tooltip on the disclosure toggle explaining why it was disabled. In this way the user could always see all the items that were selected at any given ...


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A good representation is to use an un-checked checkbox for no items, a check mark for all and a tiny filled square for some items. This is the convention Windows 8 OS.

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