1. Write a webassembly interpreter/vm; (main step) 2. Using webassembly, write an html interpreter/renderer; 3. Using webassembly, write an css, js ... interp

1. Write a webassembly interpreter/vm; (main step) 2. Using webassembly, write an html interpreter/renderer; 3. Using webassembly, write an css, js ... interpreter/renderer; 4. Keep doing this for all w3c standards for the rest of your life. Chances are that by the time you are somewhere in the middle of step 2, people will have written the other interpreters in webassembly and the result of step 1 will be a functional browser already.