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<html><body><form id="myForm"><textarea id="myTextarea" rows="4" cols="50">At w3schools.com you will learn how to make a website. We offer free tutorials in all web development technologies.</textarea></form><p>Click the button to display the id of the form the text area belongs to.</p><button type="button" onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myTextarea").form.id; document.getElementById("demo").innerHTML = x;}</script></body></html>