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27 lines
469 B
HTML
27 lines
469 B
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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.democlass {
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color: red;
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}
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</style>
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</head>
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<body>
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<h1>Hello World</h1>
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<p>Click the button to add a class attribute with the value of "democlass" to the h1 element.</p>
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<button onclick="myFunction()">Try it</button>
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<script>
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function myFunction() {
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document.getElementsByTagName("H1")[0].setAttribute("class", "democlass");
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window.alert(document.getElementsByTagName("HTML")[0].outerHTML);
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}
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</script>
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</body>
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</html>
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