Bold letter string in JavaScript

var my_str="Hello world!";
document.write(my_str.bold());

The output of above string is Hello world!

This method returns string embaded with <B> and </B> tag.

Deprecated : Avoid using it.

Try this code below, there is an options to display in normal or bold letters by selecting radio buttons.

<html>
<head>
<title>(Type a title for your page here)</title>
<script type="text/javascript">
function makebold(type){
var my_str="Hello world!";
if(type=="bold"){
document.write(my_str.bold());
}else{
document.write(my_str);
}
}
</script>
</head>

<body >
Display in <input type=radio name=bold value=yes onClick="makebold('bold')";>Bold 
<input type=radio name=bold value=yes onClick="makebold('normal')";>Normal 
</body>

</html>

JavaScript String Reference Changing letters by toUpperCase() method

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bold() : Display string in bold letters