Редактирование кода:
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<!DOCTYPE html> <html> <body> <p>Click the button to check if this document has the feature HTML DOM 1.0</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var imp = document.implementation; document.getElementById("demo").innerHTML = imp.hasFeature("HTML", "1.0"); } </script> </body> </html>