script.js

function calculate(){let e=parseFloat(document.getElementById("l").value),t=parseFloat(document.getElementById("b").value);if(e>0&&t>0){let n=e*t;document.getElementById("answer").innerHTML="Area of a rectangle with length "+e+" units and breadth "+t+" units is "+n+" unit²."}else document.getElementById("answer").innerHTML="Please enter a number which is greater than zero."}