None of this has anything to do with Adobe InDesign which doesn't even understand the SVG format. Check out the Muse or Dreamweaver forums depending on how you're designing websites.
maybe the real question Nicolas was asking is how to convert artwork that originated in InDesign as SVG output?
InDesign CS2 and CS3 was able to do that…
That feature was dropped with CS4.
With so little information, we can only guess.
Let's say you do want SVG from InDesign.
The only advantage to saving as SVG would be that text and vector lines would stay as vectors.
But the old export from ID to SVG might not have maintained those vectors.
There te is a horrible workaround to PDF to AI to SVG that could work but it could lose special effects.
So so the real question is the "advantage ".
i don't see much for a web portfolio.
Quite te honestly I would use the new Publish Online from ID. It automatically creates an interface with thumbnail, forward/back buttons and let's you use cool animations on the pages.
Now on if you have an existing websit that you want the portfolio to be on you can embed t link to the PubOnline page on your own site.
Plus I would consider turning the portfolio to fixed layout ePub or PDF. With no need for SVG.