Javascript string example program?

Html page:

<p id="P6"></p>

Javascript page:

<script>

    var carName1 = "Volvo XC60";

    var carName2 = 'Volvo XC60';

    document.getElementById("demo").innerHTML = carName1 + "<br>" + carName2;

</script>

output:

Volvo XC60

Volvo XC60