As we learned in tHe previous section, media, namely images and video, account for over 70% of tHe bytes downloaded for tHe average website. We Have already taken a look at optimizing images. THis article looks at optimizing video to improve web performance....formats, including WebM, and MPEG-4/H.264. Your video editing software...type="video/webm" /> <!-- MPEG-4/H.264: 12 MB --> <source src="video...