这两个概念在基于标准浏览器中不会造成严重的问题,这称为平稳退化(graceful degradation)的设计中非常重要。3.3.4 洋葱皮阴影 我要演示的最后一种阴影方法使用与圆角框方法非常相似的技术。
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浏览器对某些选择符的支持还不是很充分,但是CSS的设计允许平稳退化;如果无法应用某个样式,页面应该仍然是合法有效的。
Browser support for some is limited, but CSS is designed for graceful degradation; a page should still be legible and usable if a style isn't applied.
HTML 5的设计原则就是在不支持它的浏览器中能够平稳地退化。
HTML 5 was explicitly designed to degrade gracefully in browsers that don't support it.
在老式浏览器中显示时,允许内容平稳地退化。
Allows content to degrade gracefully when displayed in older browsers.
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