| CARVIEW |
Select Language
HTTP/2 301
content-length: 162
content-type: text/html
date: Tue, 14 Oct 2025 23:27:32 GMT
location: https://developer.mozilla.org/en-US/docs/Web/API/SVGStringList/insertItemBefore
server: nginx
strict-transport-security: max-age=60; includeSubDomains
via: 1.1 google
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
HTTP/2 200
content-type: text/html
x-guploader-uploadid: AAwnv3IdkyIzpAd7pMql98-KNiJRZphAU08Y9IYfayP08XnZBhQlVN1ciESsGbWApHcODmXh
cache-control: public, max-age=3600
expires: Wed, 15 Oct 2025 00:27:33 GMT
last-modified: Tue, 14 Oct 2025 01:07:17 GMT
etag: W/"09c0caeb47bc1a2cf4e2945388df390d"
x-goog-generation: 1760404037831771
x-goog-metageneration: 1
x-goog-stored-content-encoding: identity
x-goog-stored-content-length: 144379
x-goog-meta-goog-reserved-file-mtime: 1760402431
x-goog-hash: crc32c=Y6aflA==, md5=CcDK60e8Giz04pRTiN85DQ==
x-goog-storage-class: STANDARD
accept-ranges: none
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
alt-svc: clear
referrer-policy: strict-origin-when-cross-origin
x-content-type-options: nosniff
strict-transport-security: max-age=63072000
content-security-policy: default-src 'self'; script-src 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M=' 'sha256-YCNoU9DNiinACbd8n6UPyB/8vj0kXvhkOni9/06SuYw=' 'sha256-PZjP7OR6mBEtnvXIZfCZ5PuOlxoDF1LDZL8aj8c42rw='; script-src-elem 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M=' 'sha256-YCNoU9DNiinACbd8n6UPyB/8vj0kXvhkOni9/06SuYw=' 'sha256-PZjP7OR6mBEtnvXIZfCZ5PuOlxoDF1LDZL8aj8c42rw='; style-src 'report-sample' 'self' 'unsafe-inline'; object-src 'none'; base-uri 'self'; connect-src 'self' developer.allizom.org bcd.developer.allizom.org bcd.developer.mozilla.org updates.developer.allizom.org updates.developer.mozilla.org https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com https://incoming.telemetry.mozilla.org https://observatory-api.mdn.allizom.net https://observatory-api.mdn.mozilla.net https://api.github.com/search/issues stats.g.doubleclick.net https://api.stripe.com; font-src 'self'; frame-src 'self' interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net mdn.github.io live-samples.mdn.mozilla.net live-samples.mdn.allizom.net *.mdnplay.dev *.mdnyalp.dev *.play.test.mdn.allizom.net https://v2.scrimba.com https://scrimba.com jsfiddle.net www.youtube-nocookie.com codepen.io survey.alchemer.com https://js.stripe.com; img-src 'self' data: *.githubusercontent.com *.googleusercontent.com *.gravatar.com mozillausercontent.com firefoxusercontent.com profile.stage.mozaws.net profile.accounts.firefox.com developer.mozilla.org mdn.dev interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net wikipedia.org upload.wikimedia.org https://mdn.github.io/shared-assets/ https://mdn.dev/ https://*.google-analytics.com https://*.googletagmanager.com www.gstatic.com; manifest-src 'self'; media-src 'self' archive.org videos.cdn.mozilla.net https://mdn.github.io/shared-assets/; child-src 'self'; worker-src 'self';
x-frame-options: DENY
origin-trial: AxVILwizhbMjxFeHOn1P3R8niO1RJY/smaK4B4d1rLzc1gTaxtXMSaTi+FoigYgCw40uFRDwFcEAeqDR+vVLOW4AAABfeyJvcmlnaW4iOiJodHRwczovL2RldmVsb3Blci5tb3ppbGxhLm9yZyIsImZlYXR1cmUiOiJQcml2YXRlQXR0cmlidXRpb25WMiIsImV4cGlyeSI6MTc0MjA3OTYwMH0=
x-cloud-trace-context: fdd433b50f150343c68bd0eb6f214e1a
date: Tue, 14 Oct 2025 23:27:33 GMT
server: Google Frontend
via: 1.1 google
vary: Accept-Encoding
content-encoding: gzip
x-cache: miss
SVGStringList: insertItemBefore() method - Web APIs | MDN
Toggle sidebar
SVGStringList: insertItemBefore() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The insertItemBefore() method of the SVGStringList interface inserts a new item into the list at the specified position. The first item is indexed 0. The inserted item is the item itself and not a copy.
- If the new item is already in a list, it is removed from its previous list before it is inserted into this list.
- If the item is already in this list, note that the index of the item to insert before is before the removal of the item.
- If the index is equal to 0, then the new item is inserted at the front of the list.
- If the index is greater than or equal to the
length, then the new item is appended to the end of the list.
Syntax
js
insertItemBefore(newItem, index)
Parameters
Return value
The string that was added to the list.
Exceptions
NoModificationAllowedErrorDOMException-
Thrown if the
SVGStringListcorresponds to a read-only attribute or when the object itself is read-only.
Specifications
| Specification |
|---|
| Scalable Vector Graphics (SVG) 2 # __svg__SVGNameList__insertItemBefore |
Browser compatibility
Loading…