What are some best practices for implementing animations in web development without using Flash?

One best practice for implementing animations in web development without using Flash is to utilize CSS animations. By using keyframes and transitions in CSS, you can create smooth animations that are supported across various browsers and devices. Additionally, using JavaScript libraries like GreenSock Animation Platform (GSAP) can provide more advanced animation capabilities while still being lightweight and performant. ```html <!DOCTYPE html> <html> <head> <style> .box { width: 100px; height: 100px; background-color: red; animation: slidein 2s infinite alternate; } @keyframes slidein { from { transform: translateX(0); } to { transform: translateX(200px); } } </style> </head> <body> <div class="box"></div> </body> </html> ```