Attribute name selection

document.evaluate(
  '//*[@*[starts-with(name(), "data-custom-")]]',
  document, 
  null, 
  XPathResult.UNORDERED_NODE_ITERATOR_TYPE, 
  null
)

document.evaluate(
  '//*[starts-with(name(), "custom-")]',
  document, 
  null, 
  XPathResult.UNORDERED_NODE_ITERATOR_TYPE, 
  null
)

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