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{"record":{"id":"90ad130718ae9632","repo":"swc-project/swc","slug":"straydoctype","errorCode":"StrayDoctype","errorMessage":"Stray doctype","messagePattern":"Stray doctype","errorType":"validation","errorClass":"Error","httpStatus":null,"severity":"warning","filePath":"crates/swc_html_parser/src/parser/mod.rs","lineNumber":1702,"sourceCode":" // Insert the character.\n Token::Character {\n value: '\\x09' | '\\x0A' | '\\x0C' | '\\x0D' | '\\x20',\n ..\n } => {\n self.insert_character(token_and_info)?;\n }\n // A comment token\n //\n // Insert a comment.\n Token::Comment { .. } => {\n self.insert_comment(token_and_info)?;\n }\n // A DOCTYPE token\n //\n // Parse error. Ignore the token.\n Token::Doctype { .. } => {\n self.errors\n .push(Error::new(token_and_info.span, ErrorKind::StrayDoctype));\n }\n // A start tag whose tag name is \"html\"\n //\n // Process the token using the rules for the \"in body\" insertion mode.\n Token::StartTag { tag_name, .. } if tag_name == \"html\" => {\n self.process_token_using_rules(token_and_info, InsertionMode::InBody)?;\n }\n // A start tag whose tag name is one of: \"base\", \"basefont\", \"bgsound\", \"link\"\n //\n // Insert an HTML element for the token. Immediately pop the current node off\n // the stack of open elements.\n //\n // Acknowledge the token's self-closing flag, if it is set.\n Token::StartTag {\n tag_name,\n is_self_closing,\n ..\n } if matches!(&**tag_name, \"base\" | \"basefont\" | \"bgsound\" | \"link\") => {","sourceCodeStart":1684,"sourceCodeEnd":1720,"githubUrl":"https://github.com/swc-project/swc/blob/5176682b65416c6b5de6b47379ae1588ea3ecb3f/crates/swc_html_parser/src/parser/mod.rs#L1684-L1720","documentation":"A DOCTYPE token arrived while the parser was in the 'in head' insertion mode (crates/swc_html_parser/src/parser/mod.rs:1702) — inside the head element. Spec: parse error, ignore the token. This is the most common StrayDoctype in practice: a duplicated doctype appearing after head has started.","triggerScenarios":"`` or any doctype token whose preceding content already opened head. Comments and metadata before it do not close head, so the stray doctype is still processed by in-head rules.","commonSituations":"A doctype line inside a shared include partial, meta-tag snippets that carry a full document skeleton, duplicate doctypes from wrapper + content concatenation.","solutions":["Delete the doctype from head-included partials; keep exactly one at the document top","Audit includes/snippets for embedded document skeletons (doctype, html, head)","Filter ErrorKind::StrayDoctype when duplicates are acceptable"],"exampleFix":"\n\n \n \n t\n\n\n\n\n \n t\n","handlingStrategy":"validation","validationCode":"fn doctype_inside_head(html: &str) -> bool {\n let lower = html.to_ascii_lowercase();\n match (lower.find(\" lower[open..close].contains(\" lower[open..].contains(\" false,\n }\n}","typeGuard":null,"tryCatchPattern":"use swc_html_parser::error::ErrorKind;\n\nlet mut errors = Vec::new();\nlet doc = swc_html_parser::parse_file_as_document(&fm, config, &mut errors)?;\n\nfor err in &errors {\n if matches!(err.kind(), ErrorKind::StrayDoctype) {\n // Ignored inside head; head content parsed normally.\n log::warn!(\"doctype inside ignored\");\n }\n}","preventionTips":["Head includes must contain only head-legal elements (meta/link/title/style/script)","Never paste a full document skeleton into a head partial","Lint for a second `