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<html><body><form id="myForm"> <label id="myLabel" for="male">Male</label> <input type="radio" name="sex" id="male" value="male"><br></form><p>Click the "Try it" button to return the id of the form the label belongs to.</p><p id="demo"></p><button onclick="myFunction()">Try it</button><script>function myFunction(){var x = document.getElementById("myLabel").form.id;document.getElementById("demo").innerHTML=x;}</script></body></html>