Xpath In WebDriver

How XPath Works in WebDriver

At a high level, WebDriver uses a browser's native XPath capabilities wherever possible. On those browsers that don't have native XPath support, we have provided our own implementation. This can lead to some unexpected behaviour unless you are aware of the differences in the various xpath engines.

Driver	Tag and Attribute Names	Attribute Values	Native XPath Support
HtmlUnitDriver	Lower-cased	As they appear in the HTML	Yes
InternetExplorerDriver	Lower-cased	As they appear in the HTML	No
FirefoxDriver	Case insensitive	As they appear in the HTML	Yes

This is a little abstract, so for the following piece of HTML:

<input type="text" name="example" />
<INPUT type="text" name="other" />

The following will happen:

XPath expression	Number of Matches In
	HtmlUnitDriver	FirefoxDriver	InternetExplorerDriver
//input	1 ("example")	2	2
//INPUT	0	2	0

Matching Implicit Attributes

Sometimes HTML do not need attributes to be explicitly declared because they will default to known values. For example, the "input" tag does not require the "type" attribute because it defaults to "text". The rule of thumb when using xpath in WebDriver is that you should not expect to be able to match against these implicit attributes.