graceful degradation

基本解釋

First among them is its lack of provision for graceful degradation.
首先，它缺乏對(duì)功能退化的預(yù)防。
You will still have to provide fall-back support for IE6, however, either with conditional comments or through graceful degradation.
盡管如此你仍不得不通過條件注釋或優(yōu)雅降級(jí)的方法對(duì)IE6提供支持。
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.
瀏覽器對(duì)某些選擇符的支持還不是很充分，但是 CSS 的設(shè)計(jì)允許平穩(wěn)退化；如果無法應(yīng)用某個(gè)樣式，頁面應(yīng)該仍然是合法有效的。