{"record":{"id":"e0e90a5a9456e058","repo":"yewstack/yew","slug":"failed-to-create-detached-element","errorCode":null,"errorMessage":"failed to create detached element","messagePattern":"failed to create detached element","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/yew/src/dom_bundle/bsuspense.rs","lineNumber":90,"sourceCode":"impl Reconcilable for VSuspense {\n    type Bundle = BSuspense;\n\n    fn attach(\n        self,\n        root: &BSubtree,\n        parent_scope: &AnyScope,\n        parent: &Element,\n        slot: DomSlot,\n    ) -> (DomSlot, Self::Bundle) {\n        let VSuspense {\n            children,\n            fallback,\n            suspended,\n            key,\n        } = self;\n        let detached_parent = document()\n            .create_element(\"div\")\n            .expect(\"failed to create detached element\");\n\n        // When it's suspended, we render children into an element that is detached from the dom\n        // tree while rendering fallback UI into the original place where children resides in.\n        if suspended {\n            let (_child_ref, children_bundle) =\n                children.attach(root, parent_scope, &detached_parent, DomSlot::at_end());\n            let (fallback_ref, fallback) = fallback.attach(root, parent_scope, parent, slot);\n            (\n                fallback_ref,\n                BSuspense {\n                    children_bundle,\n                    fallback: Some(Fallback::Bundle(fallback)),\n                    detached_parent,\n                    key,\n                },\n            )\n        } else {\n            let (child_ref, children_bundle) = children.attach(root, parent_scope, parent, slot);","sourceCodeStart":72,"sourceCodeEnd":108,"githubUrl":"https://github.com/yewstack/yew/blob/0e4a05472fac4e5fce1befe60fa4a1e43a36b6a3/packages/yew/src/dom_bundle/bsuspense.rs#L72-L108","documentation":"When a Suspense bundle attaches (packages/yew/src/dom_bundle/bsuspense.rs:90), Yew creates a detached <div> via document().create_element to host suspended children off-tree while the fallback shows in place, and unwraps the result with .expect. createElement(\"div\") can only fail with an InvalidCharacterError, which cannot happen for the fixed valid name 'div' in a real browser — so in practice this panic indicates the code is running against a missing or non-functional DOM implementation.","triggerScenarios":"Running the client bundle in an environment whose global document cannot create elements (a bare wasm runtime, a unit-test harness without a browser DOM, or a partially mocked web-sys).","commonSituations":"Running component tests outside wasm-bindgen-test's browser runner; accidentally executing the client (wasm) suspense code path inside an SSR process with a stub DOM; broken js/wasm runtime initialization where window/document globals are absent.","solutions":["Run suspense-touching tests under a real DOM: wasm_bindgen_test with the browser test runner, or a complete DOM shim","Make sure SSR does not render the client bundle — gate client-only rendering with cfg(target_arch = \"wasm32\") and the SSR entry with the ssr feature","Update wasm-bindgen/web-sys if the environment shim is incomplete, since the panic is environmental, not a Yew bug"],"exampleFix":"// before (test runs without a DOM)\nwasm_bindgen_test::wasm_bindgen_test_configure!(run_in_node_experimental);\n\n// after (run in a real browser DOM)\n// wasm_bindgen_test_configure!(run_in_browser);  // default under the browser test runner","handlingStrategy":"validation","validationCode":"// before mounting client code, confirm a functional DOM exists\nif web_sys::window().is_none() {\n    // do not run component rendering here\n    return;\n}","typeGuard":"fn has_dom() -> bool { web_sys::window().is_some_and(|w| w.document().is_some()) }","tryCatchPattern":null,"preventionTips":["Run suspense-involving tests with the wasm-bindgen-test browser runner","Gate client rendering with cfg(target_arch = \"wasm32\") so it never executes in DOM-less runtimes","Treat any 'failed to create detached element' panic as an environment problem, not an app bug"],"tags":["rust","wasm","yew","suspense","dom","environment"],"backgroundTag":"dom-api-unavailable","analyzedSha":"0e4a05472fac4e5fce1befe60fa4a1e43a36b6a3","analyzedAt":"2026-08-22T21:16:31.212Z","schemaVersion":2},"datasetVersion":"2026-08-23T01:17:44.959Z"}