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<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>