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<!DOCTYPE html>
<html>
<body>
<div onmouseenter="boldtrue(this)" onmouseleave="boldfalse(this)">Hello Javascript!</div>
<script>
function boldtrue(x) {
x.style.fontWeight = "900";
}
function boldfalse(x) {
x.style.fontWeight = "100";
}
</script>
</body>
</html> 
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