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WAI ARIA Spec gives example of form field in a label, http://www.w3.org/TR/wai-aria/roles#textalternativecomputation under 2B "Authors sometimes embed a control within the label of another widget, where the user can adjust the embedded control's value. For example, consider a check box label that contains a text input field: "Flash the screen [input] times". If the user has entered "5" for the embedded text input, the complete label is "Flash the screen 5 times". For such cases, .... html5 says: http://www.w3.org/html/wg/drafts/html/CR/forms.html#the-label-element "Content model: Phrasing content, but with no descendant labelable elements unless it is the element's labeled control, and no descendant label elements" There appears to be a discrepancy between wai aria and html 5. Suggest investigation into them. One should change... Perhaps the wai aria doc can change it's text to... "Authors sometimes embed a control within the label of another widget, where the user can adjust the embedded control's value. <add>as an "willful violation" of HTML."</add>
HTML allows for multiple interactive things inside a label, although that is not recommended. And it works in practice too.