The One Web principle requires that content be accessible on a range of devices irrespective of differences in presentation capabilities and access mechanism. It ensures that content provided by accessing a URI (Uniform Resource Identifier) yields a thematically coherent experience when accessed from different devices
What devolves from this One Web principle is well described in an article, Best practices for mobile Web application development. It discusses the working draft guidelines on Mobile Web from the W3C. These set out to improve the user experience of the Web when accessed from mobile devices.
In a sense, the One Web Principle represents a desirable minimum. A ‘thematically coherent experience’ does not aim to achieve a satisfactory user experience, which would be a more acceptable standard. Nevertheless the One Web Principle as enunciated still represents a major technical challenge.
Related: The One Web Principle