Other versions used absolute positioned images or DIVs to make up the blocks.
<table> as a grid seemed logical.
I experimented with different methods of accessing the table (
nextSibling) to iterate
through the cells. Accessing it by
table.rows[y].cells[x] was almost as fast as
nextSibling but more convenient in terms of code-size.
Nowadays you can bring it down to 1 KB or even 512 bytes, but I did not want to give up on the scoring system, preview and VIM-bindings :-)