这些增强语法的样式表被命令行工具或者网页插件工具预处理，变成标准的CSS样式表。
Style sheets in the advanced syntax are processed by the program, and turned into regular CSS style sheets.
无论何时你想要创建对搜索引擎和对未安装插件的浏览者友好的网页时，替换内容都是你最好的朋友。
In all cases where you like to create search-engine-friendly content or content that is accessible to people who browse the web without plugins, alternative content is your best friend.
他们有一个用于收集、整理和分享旅游计划的工具，你可以带着这个插件浏览网页。
They have a tool for collecting, collating and sharing travel plans using a plug-in that follows you while you surf.
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