script.js

function calculate(){let e=parseFloat(document.getElementById("s1").value),t=parseFloat(document.getElementById("s2").value),n=parseFloat(document.getElementById("s3").value);if(e>0&&t>0&&n>0){let a=(e+t+n)/2,s=Math.sqrt(a*(a-e)*(a-t)*(a-n));document.getElementById("answer").innerHTML="Area of a triangle with first side "+e+" units, second side "+t+" units, and third side "+n+" units and semi-perimeter "+a+" units is "+s.toFixed(2)+" unit²."}else document.getElementById("answer").innerHTML="Please enter a number greater than zero."}