{literal}

<div style="padding: 20px; border: 2px solid #006872; background: #f0f0f0;">
function testCalc() {
    var val = document.getElementById('testInput').value;
    document.getElementById('testResult').innerText = val * 2;
}
    #testInput { padding: 10px; border: 1px solid #ccc; }
{/literal}