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Oxygen XML Editor includes a built-in LESS CSS Validator, integrated with general validation support. The usual validation features for presenting errors also available for LESS stylesheets.

Oxygen XML Editor provides three validation methods:
  • Automatic validation as you type - marks validation errors in the document as you are editing.
  • Validation upon request, by pressing the Validate button from the Validation toolbar drop-down menu. An error list is presented in the message panel at the bottom of the editor.
  • Validation scenarios, by selecting Configure Validation Scenario(s) from the Validation toolbar drop-down menu. Errors are presented in the message panel at the bottom of the editor. This is useful when you need to validate the current file as part of a larger LESS import hierarchy (for instance, you may change the URL of the file to validate to the root of the hierarchy).