Редактирование кода:
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<!DOCTYPE html> <html> <body> <p>Click the button to get the tag names of the body element's children.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var c = document.body.children; var txt = ""; var i; for (i = 0; i < c.length; i++) { txt = txt + c[i].tagName + "<br>"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>