Your question doesn't make sense to me as SVG is something you may want to import or export but in both case when it's inside Illustrator those are just regular pageitems. So if you want to resize something before export, then you should reference your objects and change their properties.
If you want to resize the svg once it has been exported then it's more about dealing with files reading and modifications. Given the infinite use of the SVG it would be more a question for the target application such as a browser through javascript code to resize the object.
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