SVGNumberList: 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 January 2020.

The insertItemBefore() method of the SVGNumberList 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

newItem

The SVGNumber to add to the list.

index

A non-negative integer that specifies the index of the item to insert the new item before.

Return value

The SVGNumber that was added to the list.

Exceptions

DOMException NoModificationAllowedError

Thrown if the SVGNumberList corresponds 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

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
insertItemBefore

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support