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Actually I do not use images > 150k. You can use images bigger than 150k, but I suggest to test the speed in rendering and memory usage of e-ink device, especially on older e-ink device. If a chapter has got many big images, it could be very slow to load and sometimes it can crash an ereader if it uses too much memory.
The SVG is a XML markup language to draw vectors. It is wonderful and full of things, like links, animation and "zoom". Some of this things are supported by e-reader, most not. You can also use it to "embed" bitmap, but it is only a thing you can do with it. Actually I use div and img to handle png or jpeg images in ePub2, not svg.
vh is viewport. 100vh is all the viewport. 50vh is 50% of viewport. what is viewport? is the web-page a user view. what is viewport in ebooks? well, it depends. I see testing with javascript that some ebook application thinks viewport is everything is inside the application window (the toc for example), other application only the page, other all the side-by-side pages. but, as Tex2002ans said, this is CSS3, so: no ePub2. Maybe EPUB3 (EPUB3 uses only a subset of CSS3).
f.
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