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Structure of content on the web
Code used to describe document style
General-purpose scripting language
Protocol for transmitting web resources
Interfaces for building web applications
Developing extensions for web browsers
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PDF（可移植文档格式）是一种能够用来在任何特定软、硬件平台或操作系统上分享文档的文件格式。PDF 提供打印文档的数字图像，并能在打印时保持相同的外观。