That's why the code in the example above doesn't specify preloading for the video/webm video. Instead, the best practice is to specify preloading only for the type the majority of your users are likely to actually use. Therefore, specifying preloading for multiple types of the same resource is discouraged. Note that for users whose browsers have both video/mp4 and video/webm support, if in that code a element were also specified, then both the video/mp4 and video/webm videos would be preloaded - even though only one of them would actually be used. That makes the video player hopefully smoother/more responsive for users who have video/mp4 support in their browsers. The code in the example above causes the video/mp4 video to be preloaded only in supporting browsers - and for users who have video/mp4 support in their browsers, causes the video/mp4 video to actually be used (since it's the first specified).
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