1. Zero-friction deployment. Everyone uses web browsers. 2. Reduced learning curve. Everyone is comfortable with web pages. Compare to the VMs you mention. Th

1. Zero-friction deployment. Everyone uses web browsers. 2. Reduced learning curve. Everyone is comfortable with web pages. Compare to the VMs you mention. The JVM failed at #1 despite years' head start and doesn't even try to address #2. A better example is Flash, which threaded the deployment needle amazingly well but still ran aground on the remaining barriers. Mobile is different, though.