<!DOCTYPE html>
<style>
#chart div {
background-color: brown;
height: 25px;
margin: 5px;
}
</style>
<div id="chart"> </div>
<script>
var data = [5, 25, 15, 20, 10]
for (i = 0; i < data.length; i++){
var div = document.createElement("div");
div.style.width = data[i]*10 + "px";
document.getElementById('chart').appendChild(div);
}
</script>