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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/SVGNumberList/insertItemBefore below:

SVGNumberList: insertItemBefore() method - Web APIs

Baseline Widely available

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.

insertItemBefore(newItem, index)

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.

The SVGNumber that was added to the list.

DOMException NoModificationAllowedError

Thrown if the SVGNumberList corresponds to a read-only attribute or when the object itself is read-only.

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