csslib

• Added support for escape codes in identifiers.

• Fixed a crash caused by parsing certain calc() expressions and variables names that contain numbers.

• Removed support for the shadow-piercing comibnators /deep/ and >>>. These
  were dropped from the Shadow DOM specification.

• Removed whitespace between comma-delimited expressions in compact output.

  Before:

  div{color:rgba(0, 0, 0, 0.5);}
  

  After:

  div{color:rgba(0,0,0,0.5);}
  

• Removed last semicolon from declaration groups in compact output.

  Before:

  div{color:red;background:blue;}
  

  After:

  div{color:red;background:blue}
  

• Reduced whitespace in compact output for the @page at-rule and margin boxes.
• Updated SDK version to 2.0.0-dev.17.0.
• Stop using deprecated constants.

New features

• Supports nested at-rules.
• Supports nested HTML comments in CSS comments and vice-versa.

Breaking changes

• The List<RuleSet> rulesets field on MediaDirective, HostDirective, and
  StyletDirective has been replaced by List<TreeNode> rules to allow nested
  at-rules in addition to rulesets.

• Adds support for @viewport.
• Adds support for -webkit-calc() and -moz-calc().
• Adds support for querying media features without specifying an expression. For
  example: @media (transform-3d) { ... }.
• Prevents exception being thrown for invalid dimension terms, and instead
  issues an error.

• Adds support for @-moz-document.
• Adds support for @supports.

• Parses CSS 2.1 pseudo-elements as pseudo-elements instead of pseudo-classes.
• Supports signed decimal numbers with no integer part.
• Fixes parsing hexadecimal numbers when followed by an identifier.
• Fixes parsing strings which contain unicode-range character sequences.

• Fixes analyzer error.

• Adds support for shadow host selectors :host() and :host-context().
• Adds support for shadow-piercing descendant combinator >>> and its alias
  /deep/ for backwards compatibility.
• Adds support for non-functional IE filter properties (i.e. filter: FlipH).
• Fixes emitted CSS for @page directive when body includes declarations and
  page-margin boxes.
• Exports Message from parser.dart so it's no longer necessary to import
  src/messages.dart to use the parser API.