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1. Two concepts ：
（1）xml： Extensible markup language , Yes HTML Extension of , Grammar and HTML be similar , However, its tags and attributes can be defined according to business needs , and HTML The tags and attributes in are fixed .
（2）xpath：xml
path, namely xml Path language , Yes xml A technique for finding elements or attributes in , Find information by describing the path of the element in the whole file .（ Simply put, it is the path of the element ）
explain ：html It can be regarded as a kind of fixed mark xml, therefore xpath Can also be applied to html Find elements in , and selenium
WebDriver Inside xpath Positioning is using xpath Expression to describe the path of the element , So as to locate the element .
2.xpath Expression classification ：
（1） Absolute path ： Start at root ,root.
for example ：
Absolute path ：/html/body/（ Single slash start ）
（2） Relative path ： Under one path , Other paths refer to this path .
for example ：
Relative path //（ Start with double slash ）
So both relative path and absolute path can find the file or file you want html element .
however , It is generally not recommended to use absolute paths , To find elements with relative paths .
as a result of ：
- Front end Engineer ： Change page effect , Add a special effect . Add a few div
- Absolute path
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