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SVGNumberList - Web APIs | MDN
length
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The number of items in the list.
numberOfItems
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The number of items in the list.
appendItem()
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Inserts a new item at the end of the list.
clear()
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Clears all existing items from the list, with the result being an empty list.
initialize()
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Clears all existing items from the list and re-initializes the list to hold the single item specified by the parameter.
getItem()
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Returns the specified item from the list.
insertItemBefore()
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Inserts a new item into the list at the specified position.
removeItem()
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Removes an existing item from the list.
replaceItem()
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Replaces an existing item in the list with a new item.