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<!DOCTYPE html> <html> <head> <link id="myLink" href="domoarigato.htm" hreflang="ja"> </head> <body> <p>Click the button to change the language code of the linked document.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myLink").hreflang = "en-us"; document.getElementById("demo").innerHTML = "The language code was changed from 'ja' to 'en-us'."; } </script> </body> </html>