A relative address always starts from the directory in which the current document is located. In contrast, absolute addressing always starts from a root directory. The following table demonstrates the difference in syntax between relative and absolute referencing:
相对地址通常从当前文档所在的目录开始。而绝对地址则通常从根目录开始。下表说明相对引用与绝对引用在语法上的区别：