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33 lines
750 B
HTML
33 lines
750 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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var before = document.getElementsByTagName("H1")[0].outerHTML;
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console.assert(before === '<H1>Hello World</H1>', 'H1');
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document.getElementsByTagName("H1")[0].setAttribute("class", "democlass");
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var after = document.getElementsByTagName("H1")[0].outerHTML;
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console.assert(after === '<H1 class="democlass">Hello World</H1>', 'H1 with class');
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}
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console.error("element.setAttribute.html");
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myFunction();
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console.exit(0);
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</script>
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</body>
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</html>
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