<script>
camel('font-size');
function camel(str) {
var arr = str.split('-');
var firsLowerCase = arr[0];
var txt1 = '';
for (var i = 1; i < arr.length; i++) {
var txt = arr[i].replace(arr[i][0], arr[i][0].toUpperCase());
txt1 += txt;
}
console.log(firsLowerCase.concat(txt1));
};
</script>
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