Why does the Xpath that works with $x not work with document.evaluate?

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There could be several reasons why an Xpath that works with $x does not work with document.evaluate:

1. Namespace differences: If the Xpath contains namespaces, it may not work with document.evaluate unless the namespaces are explicitly declared. $x may automatically resolve namespaces, while document.evaluate requires explicit namespace declarations.

2. Different default contexts: $x may use the current context as the default context when evaluating Xpaths, while document.evaluate may use a different context.

3. Syntax differences: $x may allow for certain syntax shortcuts or shorthand not supported by document.evaluate.

4. Implementation differences: The Xpath engine used by $x may be different than the one used by document.evaluate, leading to different behavior and results.

5. Unsupported Xpath features: $x may support certain Xpath features that are not supported by document.evaluate, leading to errors or incorrect results.