Each script is loaded into the browser every time. Storing the HTML would be huge. I came to perl to make my site as teeny-weeny as possible, and I have succeeded. Since I don't have to store so much HTML (some inline elements remain to be coded out), my site has gone from 10 MB (the max allowed on one web server) to a mere 2.5 MB with a lot more content and data! All of those HTML tags take up a lot of space.