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Difference between Black Box and White Box Testing

1. Synonyms for black-box include: behavioral, functional, opaque-box, and closed-box. 2. Synonyms for white-box include: structural, glass-box and clear-box. 3. Generally black box testing will begin early in the software development i.e. in requirement gathering phase itself. But for white box testing approach one has to wait for the designing has to complete. 4. We can use black testing strategy almost any size either it may be small or large. But white box testing will be effective only for small lines of codes or piece of codes. 5. In white box testing we can not test Performance of the application. But in Black box testing we can do it.

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XPath is defined as XML path. It is a syntax or language for finding any element on the web page using XML path expression. XPath is used to find the location of any element on a webpage using HTML DOM structure. 

Syntax for XPath: XPath contains the path of the element situated at the web page. Standard syntax for creating XPath is. Xpath=//tagname[@attribute='value'] 

// : Select current node. 

Tagname: Tagname of the particular node. 

@: Select attribute. 

Attribute: Attribute name of the node. 

Value: Value of the attribute. 

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