--- /dev/null
+Error Reporting
+===============
+
+Errors are returned by the Parser and Sanitizer as arrays
+
+ [ $code, $line, $character, ... ]
+
+`$code` is a short string, with values and definitions listed below. `$line`
+and `$character` indicate the location of the error. Some errors may have
+additional parameters after the character, as described below.
+
+Error Tags
+----------
+
+* **at-rule-block-not-allowed**: An at-rule was provided with a block, but that
+ type of at-rule cannot take a block. One extra parameter, the name of the
+ at-rule in question.
+
+* **at-rule-block-required**: An at-rule needs a block but was not provided
+ with one. One extra parameter, the name of the at-rule in question.
+
+* **bad-character-in-url**: An invalid character was encountered while parsing
+ a (non-quoted) `url()`.
+
+* **bad-escape**: An invalid character was encountered while parsing an escape
+ sequence.
+
+* **bad-value-for-property**: A property was supplied with an invalid or
+ unsupported value. One extra parameter, the name of the property in question.
+
+* **expected-at-rule**: An at-rule was expected but something else was found.
+ One extra parameter, the name of the at-rule in question.
+
+* **expected-colon**: A colon was expected, but something else was found.
+
+* **expected-declaration**: A declaration was expected, but something else was
+ found.
+
+* **expected-declaration-list**: A list of declarations was expected, but
+ something else was found.
+
+* **expected-eof**: The end of the input was expected, but there was additional
+ input.
+
+* **expected-ident**: An identifier was expected, but something else was found.
+
+* **expected-page-margin-at-rule**: One of the margin at-rules for `page` was
+ expected, but something else was found.
+
+* **expected-qualified-rule**: A qualified rule (e.g. a style rule rather than
+ an at-rule) was expected, but something else was found.
+
+* **expected-stylesheet**: A stylesheet or list of rules was expected, but
+ something else was found.
+
+* **invalid-font-face-at-rule**: The `font-face` rule cannot have anything in
+ between the `font-face` and the block.
+
+* **invalid-font-feature-value**: The feature value at-rules inside
+ `font-feature-values` cannot have anything in between the at-keyword and the
+ block. One extra parameter, the name of the at-rule in question.
+
+* **invalid-font-feature-value-declaration**: The feature value at-rules inside
+ a `font-feature-values` map arbitrary identifiers to one or more numbers.
+ Either a non-number was provided or an incorrect number of numbers were
+ provided. One extra parameter, the name of the at-rule in question.
+
+* **invalid-font-feature-values-font-list**: An invalid font list was supplied
+ for `font-feature-values`.
+
+* **invalid-import-value**: An invalid URL and/or media query was provided for
+ `import`.
+
+* **invalid-keyframe-name**: An invalid keyframe name was supplied for
+ `keyframes`.
+
+* **invalid-media-query**: An invalid media query was supplied for `media`.
+
+* **invalid-namespace-value**: An invalid value was supplied for `namespace`.
+
+* **invalid-page-margin-at-rule**: The margin at-rules inside `page` cannot
+ have anything in between the at-keyword and the block. One extra parameter,
+ the name of the at-rule in question.
+
+* **invalid-page-rule-content**: A `page` at-rule may contain only
+ declarations and margin at-rules. Something else was found.
+
+* **invalid-page-selector**: An invalid page selector was supplied for `page`.
+
+* **invalid-selector-list**: An invalid selector was supplied for a style rule.
+
+* **invalid-supports-condition**: An invalid condition was supplied for
+ `supports`.
+
+* **misordered-rule**: A rule ordering requirement (e.g. that `import` must
+ come before `namespace`) was violated.
+
+* **missing-font-feature-values-font-list**: No font list was supplied for
+ `font-feature-values`.
+
+* **missing-import-source**: No URL was supplied for `import`.
+
+* **missing-keyframe-name**: No keyframe name was supplied for `keyframes`.
+
+* **missing-namespace-value**: No namespace was supplied for `namespaces`.
+
+* **missing-selector-list**: No selector was supplied for a style rule.
+
+* **missing-supports-condition**: No condition was supplied for `supports`.
+
+* **missing-value-for-property**: No value was supplied for a property. One
+ extra parameter, the name of the property in question.
+
+* **newline-in-string**: A newline was encountered inside a quoted string.
+
+* **recursion-depth-exceeded**: Blocks and/or functions were nested too deeply.
+ The rest of the input was ignored.
+
+* **unclosed-comment**: An unclosed comment was encountered.
+
+* **unclosed-string**: An unclosed string was encountered.
+
+* **unclosed-url**: An unclosed (non-quoted) `url()` was encountered.
+
+* **unexpected-eof**: The end of the input was encountered unexpectedly.
+
+* **unexpected-eof-in-block**: The end of the input was encountered
+ unexpectedly while parsing a block.
+
+* **unexpected-eof-in-function**: The end of the input was encountered
+ unexpectedly while parsing a function.
+
+* **unexpected-eof-in-rule**: The end of the input was encountered unexpectedly
+ while parsing a rule.
+
+* **unexpected-token-in-declaration-list**: An unexpected token was encountered
+ while parsing a list of declarations or a list of declarations-and-at-rules.
+
+* **unrecognized-property**: A property was encountered that is not recognized
+ in the current context.
+
+* **unrecognized-rule**: A rule was encountered that is not recognized in the
+ current context.
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