{"record":{"id":"5991141f739ebf25","repo":"swc-project/swc","slug":"strayendtag","errorCode":"StrayEndTag","errorMessage":"Stray end tag \"{tag_name}\"","messagePattern":"Stray end tag \"(.+?)\"","errorType":"validation","errorClass":"Error","httpStatus":null,"severity":"warning","filePath":"crates/swc_html_parser/src/parser/mod.rs","lineNumber":1647,"sourceCode":" Token::StartTag { tag_name, .. } if tag_name == \"head\" => {\n let element = self.insert_html_element(token_and_info)?;\n\n self.head_element_pointer = Some(element);\n self.insertion_mode = InsertionMode::InHead;\n }\n // An end tag whose tag name is one of: \"head\", \"body\", \"html\", \"br\"\n //\n // Act as described in the \"anything else\" entry below.\n Token::EndTag { tag_name, .. }\n if matches!(&**tag_name, \"head\" | \"body\" | \"html\" | \"br\") =>\n {\n anything_else(self, token_and_info)?;\n }\n // Any other end tag\n //\n // Parse error. Ignore the token.\n Token::EndTag { tag_name, .. } => {\n self.errors.push(Error::new(\n token_and_info.span,\n ErrorKind::StrayEndTag(tag_name.clone()),\n ));\n }\n // Anything else\n //\n // Insert an HTML element for a \"head\" start tag token with no attributes.\n //\n // Set the head element pointer to the newly created head element.\n //\n // Switch the insertion mode to \"in head\".\n //\n // Reprocess the current token.\n _ => {\n anything_else(self, token_and_info)?;\n }\n }\n }","sourceCodeStart":1629,"sourceCodeEnd":1665,"githubUrl":"https://github.com/swc-project/swc/blob/5176682b65416c6b5de6b47379ae1588ea3ecb3f/crates/swc_html_parser/src/parser/mod.rs#L1629-L1665","documentation":"In the 'before head' insertion mode (crates/swc_html_parser/src/parser/mod.rs:1647), any end tag other than head/body/html/br is a parse error (StrayEndTag) and is ignored. The parser is past but has not built yet, so such closers match nothing.","triggerScenarios":"An end tag directly following the html start tag with no head started: ``, `\\ntext`. The four exceptional names (head/body/html/br) take the 'anything else' path that implicitly creates .","commonSituations":"Layout templates with stray closers left in the pre-head region, trimmed partials pasted after an explicit , hand-written document shells.","solutions":["Remove the stray end tag from the region between and the first head/body content","Let the parser auto-create head/body and place markup there","Filter ErrorKind::StrayEndTag(_) if pre-head junk is tolerated"],"exampleFix":"\n\n \n
x
\n\n\n\n\n
x
\n","handlingStrategy":"validation","validationCode":"fn end_tag_before_head(html: &str) -> Option {\n let lower = html.to_ascii_lowercase();\n let html_end = lower.find(\" before ignored\", tag);\n }\n}","preventionTips":["Keep the region between and head content free of stray markup","Generate document shells from one tested template","Treat pre-head orphan closers as shell-template bugs"],"tags":["html","parser","end-tag","orphan","insertion-mode","swc"],"backgroundTag":"stray-end-tag","analyzedSha":"5176682b65416c6b5de6b47379ae1588ea3ecb3f","analyzedAt":"2026-08-17T16:16:52.067Z","contentChangedAt":"2026-08-17T16:16:52.067Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}