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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Aula 1</title>
</head>
<body>
<h1 style="color: purple">DBO</h1><br>
<!--
style é um atributo de h1,
css é para dar a aparência...
-->
<h3>ABCDEFGH</h3><br>
<p>
ola mvjdk msjksjdjsmdj
mdkismdj m,djsdmsjd
mskidjmskd
</p>
<!--
Isto é um comentário...
-->
<input type="integer" name="var1" value=""><br>
<input type="integer" name="var2" value=""><br>
<button type="button" name="button" onclick="soma()"></button><br>
<output name="result"></output>
<script type="text/javascript">
function soma(){
var v1 = document.getElementsByTagName("input")[0]
var v2 = document.getElementsByTagName("input")[1]
document.getElementsByTagName("output")[0].innerText = parseInt(v1.value) + parseInt(v2.value)
}
</script>
</body>
</html>