That would be cool if actually converting HTML to SVG would save you bandwidth and all the rest that goes with web requests. Imagine a web browser that only supports SVG and converts all HTML to SVG then when browsing the web you would only look at screenshots of websites and webpages. This would be something like read-only browser. It is already possible[0] tho but it is not enabled by default nor it is exclusive feature.

[0] https://frankgroeneveld.nl/2021/08/24/most-underused-browser...