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why is 0th char not H1 in My code 2017/01/13 13:46

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<!DOCTYPE html>
<html>
    <head>
        <title>Page Title</title>
    </head>
    <body>
        
    </body>
</html>

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// why is the zeroeth char not H1?
var i=0;
while (i<=10) {
    document.write(i + "<h1/>");
    i++;
}
var x=0;
while (x<=10) {
    document.write(x + "<h1/>");
    x++;
}

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