diff --git a/.changeset/svg-vector-effect-streamed-suspense.md b/.changeset/svg-vector-effect-streamed-suspense.md
new file mode 100644
index 0000000..74f215f
--- /dev/null
+++ b/.changeset/svg-vector-effect-streamed-suspense.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/redact': patch
+---
+
+Map `vectorEffect` to `vector-effect` so it takes effect and no longer fails hydration, and keep SVG attribute casing, namespace and position for Suspense boundaries streamed directly inside `<svg>`.
diff --git a/packages/redact/src/core/attributes.ts b/packages/redact/src/core/attributes.ts
index 022d069..02946bb 100644
--- a/packages/redact/src/core/attributes.ts
+++ b/packages/redact/src/core/attributes.ts
@@ -4,7 +4,7 @@ export const STRING_BOOLEAN_ATTRS = /^(contenteditable|draggable|spellcheck)$/
 export function attributeName(name: string, isSvg?: boolean): string {
   if (name === 'className') return 'class'
   if (name === 'htmlFor') return 'for'
-  if ((isSvg && /^(clip|fill|stroke)/.test(name)) || /^(httpEquiv|acceptCharset|maskType)$/.test(name)) {
+  if ((isSvg && /^(clip|fill|stroke|vector)/.test(name)) ||/^(httpEquiv|acceptCharset|maskType)$/.test(name)) {
     return name.replace(/[A-Z]/g, m => '-' + m.toLowerCase())
   }
   if (name === 'tabIndex' || name === 'crossOrigin') return name.toLowerCase()
diff --git a/packages/redact/src/server/bootstrap-script.ts b/packages/redact/src/server/bootstrap-script.ts
index 6acb6aa..ff519df 100644
--- a/packages/redact/src/server/bootstrap-script.ts
+++ b/packages/redact/src/server/bootstrap-script.ts
@@ -12,6 +12,8 @@
  *              The fallback div is visible (it's the user-visible loading
  *              state); only the resolved-content staging div is `hidden`
  *              before $RC moves its children inline.
+ *   Inside <svg>, the fallback wrapper is <g> and the staging element is a
+ *   hidden <svg>, so the parser keeps the content in the SVG namespace.
  *
  * Client hydration calls $RH(ID, cb) to register a callback invoked once the
  * boundary has been revealed (or immediately, if it was already revealed).
diff --git a/packages/redact/src/server/stream.ts b/packages/redact/src/server/stream.ts
index 694a489..fbbea88 100644
--- a/packages/redact/src/server/stream.ts
+++ b/packages/redact/src/server/stream.ts
@@ -221,6 +221,7 @@ function streamBoundary(
           onError: options.onError,
         componentStack: b.componentStack,
         resourceScope,
+        textState: { bits: b.svg },
       })
       state.frame?.resources?.mergeScope(resourceScope)
     } catch (err) {
@@ -236,7 +237,9 @@ function streamBoundary(
       if (hints) emit(hints)
     }
 
-    emit(`<div hidden id="S:${b.id}">${parts.join('')}</div>${revealScript(b.id, nonce, styles)}`)
+    // SVG content must stage inside <svg> to be parsed in the SVG namespace.
+    const tag = b.svg ? 'svg' : 'div'
+    emit(`<${tag} ${b.svg ? 'style="display:none"' : 'hidden'} id="S:${b.id}">${parts.join('')}</${tag}>${revealScript(b.id, nonce, styles)}`)
 
     // Recurse: any nested suspensions inside the now-revealed content
     for (const s of sub) streamBoundary(s, emit, options, state)
diff --git a/packages/redact/src/server/walk.ts b/packages/redact/src/server/walk.ts
index c015f74..9a92aee 100644
--- a/packages/redact/src/server/walk.ts
+++ b/packages/redact/src/server/walk.ts
@@ -54,6 +54,8 @@ export interface SuspendedBoundary {
   thenable: Promise<any>
   contextSnapshot: ContextSnapshot
   componentStack: string
+  // SVG bit of the parent's traversal flags, restored when the boundary streams.
+  svg: number
 }
 
 export interface WalkOptions {
@@ -490,6 +492,7 @@ function walkSuspense(
     if (suspended) opts.onSuspend?.({
       id, fallbackHTML: fallbackParts.join(''), children: props.children, thenable, contextSnapshot,
       componentStack: thrownInfo.componentStack || opts.componentStack || '',
+      svg: opts.textState!.bits & 1,
     })
     return
   }
@@ -512,8 +515,10 @@ function walkSuspense(
 function emitBoundary(opts: WalkOptions, id: number, fallbackHTML: string): void {
   // Visible div wrapper so the fallback UI shows; B: id lets $RC locate it on
   // reveal. The leading/trailing comments let hydration detect a pending
-  // boundary and register a reveal callback.
-  opts.emit(`<!--$?${id}--><div id="B:${id}">`)
+  // boundary and register a reveal callback. A div would make the HTML parser
+  // break out of an enclosing <svg>, so SVG boundaries wrap with g instead.
+  const tag = opts.textState!.bits & 1 ? 'g' : 'div'
+  opts.emit(`<!--$?${id}--><${tag} id="B:${id}">`)
   opts.emit(fallbackHTML)
-  opts.emit(`</div><!--/$-->`)
+  opts.emit(`</${tag}><!--/$-->`)
 }
diff --git a/scripts/size-check.mjs b/scripts/size-check.mjs
index fc69f74..0c1ee60 100644
--- a/scripts/size-check.mjs
+++ b/scripts/size-check.mjs
@@ -63,11 +63,17 @@ const STORE_HYDRATION_SIZE_ALLOWANCE = {
   'redact/dom-client (hydration=stub)': [3, 0],
 }
 
+// Measured overage of the SVG vectorEffect and streamed Suspense context fix, [source, built] gzip bytes.
+const SVG_CONTEXT_SIZE_ALLOWANCE = {
+  'redact/server': [45, 47],
+  'redact/dom-client (hydration=stub)': [6, 7],
+}
+
 let failed = false
 for (const tree of ['src', 'dist']) {
   for (const row of await measureSizes(tree)) {
     const baseBudget = BUDGETS[row.name]
-    const budget = baseBudget === undefined ? undefined : baseBudget + (STORE_HYDRATION_SIZE_ALLOWANCE[row.name]?.[tree === 'src' ? 0 : 1] ?? 0) + (ROOT_TRANSITION_SIZE_ALLOWANCE[row.name]?.[tree === 'src' ? 0 : 1] ?? 0) + (QUEUE_SIZE_ALLOWANCE[row.name]?.[tree === 'src' ? 0 : 1] ?? 0)
+    const budget = baseBudget === undefined ? undefined : baseBudget + (SVG_CONTEXT_SIZE_ALLOWANCE[row.name]?.[tree === 'src' ? 0 : 1] ?? 0) + (STORE_HYDRATION_SIZE_ALLOWANCE[row.name]?.[tree === 'src' ? 0 : 1] ?? 0) + (ROOT_TRANSITION_SIZE_ALLOWANCE[row.name]?.[tree === 'src' ? 0 : 1] ?? 0) + (QUEUE_SIZE_ALLOWANCE[row.name]?.[tree === 'src' ? 0 : 1] ?? 0)
     const ok = budget !== undefined && row.gz <= budget
     failed ||= !ok
     console.log(`${ok ? 'PASS' : 'FAIL'} ${tree} ${row.name}: ${row.gz} B gzip, budget ${budget ?? 'missing'}`)
diff --git a/tests/svg-attribute-casing.test.tsx b/tests/svg-attribute-casing.test.tsx
index ae6a9b9..bfb40ea 100644
--- a/tests/svg-attribute-casing.test.tsx
+++ b/tests/svg-attribute-casing.test.tsx
@@ -1,8 +1,98 @@
 import { expect, it } from 'vitest'
-import { createElement as h, Suspense } from 'react'
-import { hydrateRoot } from 'react-dom/client'
+import { createElement as h, Suspense, type ReactNode } from 'react'
+import { createRoot, hydrateRoot } from 'react-dom/client'
 import { flushSync } from 'react-dom'
-import { renderToString } from 'react-dom/server'
+import { renderToReadableStream, renderToString } from 'react-dom/server'
+import { BOUNDARY_REVEAL_RUNTIME } from '../packages/redact/src/server/bootstrap-script'
+
+const SVG_NS = 'http://www.w3.org/2000/svg'
+const HTML_NS = 'http://www.w3.org/1999/xhtml'
+
+// Releases the suspended child only after the shell has flushed, so the boundary is really outlined.
+async function streamAfterShell(make: (Late: (props: { children: ReactNode }) => ReactNode) => ReactNode) {
+ let ready = false, release!: () => void
+ const gate = new Promise<void>(resolve => { release = () => { ready = true; resolve() } })
+ const Late = ({ children }: { children: ReactNode }) => { if (!ready) throw gate; return children }
+ const tree = make(Late)
+ const reader = (await renderToReadableStream(tree)).getReader(), decoder = new TextDecoder()
+ let html = ''
+ for (let first = true; ; first = false) {
+  const { done, value } = await reader.read()
+  if (done) break
+  html += decoder.decode(value, { stream: true })
+  if (first) release()
+ }
+ return { tree, html }
+}
+
+// Loads the markup without its scripts, so the test controls when the boundary reveals.
+function loadStreamed(html: string) {
+ const container = document.createElement('div')
+ container.innerHTML = html.replace(/<script[\s\S]*?<\/script>/g, '')
+ document.body.append(container)
+ new Function(BOUNDARY_REVEAL_RUNTIME)()
+ const id = +/id="S:(\d+)"/.exec(html)![1]!
+ return { container, reveal: () => (window as any).$RC(id) }
+}
+
+it('hyphenates vectorEffect through SSR, hydration and client render', () => {
+ const tree = h(Suspense, { fallback: null }, h('main', null, h('svg', null, h('path', { d: 'M0 0L9 9', vectorEffect: 'non-scaling-stroke' }))))
+ const html = renderToString(tree); expect(html).toContain('vector-effect="non-scaling-stroke"')
+ const container = document.createElement('div'); container.innerHTML = html; document.body.append(container)
+ const main = container.querySelector('main'), errors: unknown[] = []
+ const root = hydrateRoot(container, tree, { onRecoverableError: error => errors.push(error) })
+ try { expect(container.querySelector('main')).toBe(main); expect(errors).toEqual([]); expect(container.querySelector('path')!.getAttribute('vector-effect')).toBe('non-scaling-stroke') }
+ finally { flushSync(() => root.unmount()); container.remove() }
+ const client = document.createElement('div'), clientRoot = createRoot(client)
+ flushSync(() => clientRoot.render(tree))
+ expect(client.querySelector('path')!.getAttributeNames()).toContain('vector-effect')
+ flushSync(() => clientRoot.unmount())
+})
+
+it('keeps SVG context for a boundary streamed inside <svg>', async () => {
+ const { tree, html } = await streamAfterShell(Late => h('main', null, h('svg', { viewBox: '0 0 9 9' }, h(Suspense, { fallback: h('rect', { id: 'f' }) }, h(Late, null, h('symbol', { id: 't', preserveAspectRatio: 'none' }), h('path', { id: 'p', vectorEffect: 'non-scaling-stroke' }))))))
+ expect(html).toContain('preserveAspectRatio="none"'); expect(html).toContain('vector-effect="non-scaling-stroke"'); expect(html).not.toContain('preserveaspectratio')
+ const { container, reveal } = loadStreamed(html)
+ const svg = container.querySelector('main > svg')!
+ try {
+  expect(container.querySelector('#f')!.namespaceURI).toBe(SVG_NS); expect(svg.contains(container.querySelector('#f'))).toBe(true)
+  reveal()
+  const symbol = container.querySelector('#t')!
+  expect(symbol.parentElement).toBe(svg); expect(symbol.namespaceURI).toBe(SVG_NS); expect(symbol.getAttribute('preserveAspectRatio')).toBe('none')
+  expect(container.querySelector('#p')!.namespaceURI).toBe(SVG_NS); expect(container.querySelector('#f')).toBeNull(); expect(container.querySelector('[id^="S:"]')).toBeNull()
+  const errors: unknown[] = [], root = hydrateRoot(container, tree, { onRecoverableError: error => errors.push(error) })
+  try { await new Promise(resolve => setTimeout(resolve)); expect(errors).toEqual([]); expect(container.querySelector('#t')).toBe(symbol) }
+  finally { flushSync(() => root.unmount()) }
+ } finally { (window as any).$RE_stop?.(); container.remove() }
+})
+
+it('hydrates an SVG boundary whose reveal arrives after hydration starts', async () => {
+ const { tree, html } = await streamAfterShell(Late => h('main', null, h('svg', null, h(Suspense, { fallback: h('rect', { id: 'f' }) }, h(Late, null, h('symbol', { id: 't', preserveAspectRatio: 'none' }))))))
+ const { container, reveal } = loadStreamed(html)
+ const svg = container.querySelector('main > svg')!, fallback = container.querySelector('#f')
+ const errors: unknown[] = [], root = hydrateRoot(container, tree, { onRecoverableError: error => errors.push(error) })
+ try {
+  await new Promise(resolve => setTimeout(resolve))
+  expect(container.querySelector('main > svg')).toBe(svg); expect(container.querySelector('#f')).toBe(fallback)
+  reveal()
+  await new Promise(resolve => setTimeout(resolve, 20))
+  const symbol = container.querySelector('#t')!
+  expect(errors).toEqual([]); expect(container.querySelector('main > svg')).toBe(svg); expect(container.querySelector('#f')).toBeNull()
+  expect(symbol.parentElement).toBe(svg); expect(symbol.namespaceURI).toBe(SVG_NS); expect(symbol.getAttribute('preserveAspectRatio')).toBe('none')
+ } finally { flushSync(() => root.unmount()); (window as any).$RE_stop?.(); container.remove() }
+})
+
+it('keeps HTML context for a boundary streamed inside <foreignObject>', async () => {
+ const { html } = await streamAfterShell(Late => h('main', null, h('svg', null, h('foreignObject', null, h(Suspense, { fallback: h('p', { id: 'f' }) }, h(Late, null, h('p', { id: 't', tabIndex: 0 })))))))
+ expect(html).toContain('tabindex="0"')
+ const { container, reveal } = loadStreamed(html)
+ try {
+  expect(container.querySelector('#f')!.namespaceURI).toBe(HTML_NS)
+  reveal()
+  expect(container.querySelector('#t')!.namespaceURI).toBe(HTML_NS); expect(container.querySelector('foreignObject')!.contains(container.querySelector('#t'))).toBe(true)
+ } finally { (window as any).$RE_stop?.(); container.remove() }
+})
+
 it.each([
  ['pattern', 'patternUnits', 'userSpaceOnUse'],
  ['pattern', 'patternContentUnits', 'objectBoundingBox'],