Guideline 3.1 Readable Understanding Readable | How to Meet Readable Make text content readable and understandable. Success Criterion 3.1.1 Language of Page Understanding Language of Page | How to Meet Language of Page (Level A) The default human language of each Web page can be programmatically determined . Success Criterion 3.1.2 Language of Parts Understanding Language of Parts | How to Meet Language of Parts (Level AA) The human language of each passage or phrase in the content can be programmatically determined except for proper names, technical terms, words of indeterminate language, and words
      or phrases that have become part of the vernacular of the immediately surrounding
      text. Success Criterion 3.1.3 Unusual Words Understanding Unusual Words | How to Meet Unusual Words (Level AAA) A mechanism is available for identifying specific definitions of words or phrases used in an unusual or restricted way , including idioms and jargon . Success Criterion 3.1.4 Abbreviations Understanding Abbreviations | How to Meet Abbreviations (Level AAA) A mechanism for identifying the expanded form or meaning of abbreviations is available.