Not criticism, just explaining a problem I noticed and would make a fun exercise in CSS, or JS: When a letter appears at the end of the line, the reflow (to make sure the whole text is centered) is not smooth, of course it isn't because the text is now n+1 characters wide and the rendering engine has probably been instructed to center it without any fancy delays. I wonder how to achieve a smooth "growth" of line.

I suppose one could render the text off-screen or in an invisible DIV, measure how many letters it has on the target display, find the time to render the line (if the text shows at 2 chars/sec, 20 chars takes 10 seconds to render), measure how wide the element is with the 20 chars, and then make it a DIV where the text within it is left-justified, and the DIV's left margin shrinks at a constant rate per animation frame.