Coordinate-based HTML/CSS implementation is too inconsistent across implementations and versions to be relied upon, especially with regard to fonts. What are s

Coordinate-based HTML/CSS implementation is too inconsistent across implementations and versions to be relied upon, especially with regard to fonts. What are some good WYSIWYG vector standards, including the font department? It could be useful for a GUI markup standard also so that we can have platform-neutral GUI's and GUI's over HTTP. The server side may still have a dynamic/flow layout engine, but calculated coordinates are sent to the client, keeping the client simpler and more predictable.