Make validation controls visually distinct from nonvalidation controls, whether through the typeface used in the text edit field, the border color, or the background color for the field itself.

一个基本的改进是使确认控件在视觉上与非确认控件区分开来，无论是文本编辑字段使用的字体、不同的边界颜色，甚至是字段本身不同的背景颜色。

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Apple seems to have a lock on a special formula that enables the company to design gadgets that are visually appealing and yet simple, while remaining distinct from the market.

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