Returns text of the node. Throws error if node contains anythings that not a text. Example: ```css h1::text() ``` Would throw an error in case of: <img width="385" alt="screen shot 2017-01-22 at 18 47 01" src="https://cloud.githubusercontent.com/assets/973543/22184913/46d68228-e0d3-11e6-86a2-de3884391454.png"> This is going to be combined with "extractText" function (used to extract text from the node when it contains other elements).
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