在不同浏览器和屏幕分辨率下的额外空白量都差不多，更符合视觉吸引力要求。
The amount of extra white space is similar between all browsers and screen resolutions, which can be more visually appealing.
若编译servlet并尝试在Web浏览器中载入它，您只会看到一个空白的屏幕，同样，您应确保至少会看到这样的空白屏幕。
If you compile your servlet and try to load it in a Web browser, you'll only get a blank screen; still, you should make sure you get at least that.
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