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<!DOCTYPE html> <html> <body> <input type="week" id="myWeek" value="2014-W15"> <p>Click the button to increment the value of the week field by 10 weeks (each time you click).</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> input elements with type="week" are not supported in Firefox.</p> <script> function myFunction() { document.getElementById("myWeek").stepUp(10); } </script> </body> </html>