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百度 讨论国家治理体系对文学格局的影响，需要分析秦汉国家建构与“制度文学”的关系，讨论在国家层面如何通过制度的建构整合秦汉思想观念、社会形态和民间信仰，分析秦汉公文文学化的历史认知过程和创作实践过程，描述出文学服务于制度的基本模式、制度之于文学的主要影响。

Graceful degradation is a design philosophy that centers around trying to build a modern website/application that will work in the newest browsers, but falls back to an experience that while not as good still delivers essential content and functionality in older browsers.

Polyfills can be used to build in missing features with JavaScript, but acceptable alternatives to features like styling and layout should be provided where possible, for example by using the CSS cascade, or HTML fallback behavior.

It is a useful technique that allows Web developers to focus on developing the best possible websites, given that those websites are accessed by multiple unknown user-agents. Progressive enhancement is related but different — often seen as going in the opposite direction to graceful degradation. In reality both approaches are valid and can often complement one another.