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CDATA Escapes

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Requirements

Hard Requirements

  • It must be possible to have the string "</script>" in a string literal in inline JavaScript without having to use JS-level escapes. (This possibility may be limited to scripts that use the "Hide from old browsers" pattern.)
  • It must be possible to have "" in string literals in inline JavaScript without having to use JS-level escapes.
  • Must not rewind and reparse with different rules.

Medium Requirements

  • It should be possible to have the string and still the trailing part of the page shouldn't get eaten up into the script or style element.
  • Pages authored naively for HTML5-parsing-enabled UAs shouldn't be XSS risks in legacy UAs.
  • When the author uses comment-like syntax in the fallback markup in iframe, noembed or noframes, the comment-like syntax should span the same character run that it would if it were parsed as markup.