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  1. HTML MUST be easily readable. The following guidelines are RECOMMENDED for increasing readability.
    1. No more than one tag per line.
    2. Correct indentation.
  2. HTML SHOULD be using the HTML5 doctype.
  3. Closing slashes MUST NOT be used on void elements. (img, br etc)
  4. All tags and attributes MUST be in lowercase.
  5. All attribute values MUST be enclosed by double-quotes.