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.