Subscript

You ought to be a chemist if you need this button to specify the number of atoms in a chemical formula!

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var editor = AlloyEditor.editable('myContentEditable', {
    toolbars: {
        styles: {
            selections: [
                {
                    name: 'text',
                    buttons: ['subscript'],
                    test: AlloyEditor.SelectionTest.text
                }
            ]
        }
    }
});