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<!DOCTYPE html> <html> <body> <input type="week" id="myWeek" value="1995-W35"> <p>Click the button to display the default value of the week field.</p> <button type="button" onclick="myFunction()">Try it</button> <p><strong>Note:</strong> input elements with type="week" are not supported in Internet Explorer or Firefox.</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myWeek").defaultValue; document.getElementById("demo").innerHTML = x; } </script> </body> </html>