Not to ask a dumb question, but... Why don't you ask the people who created spectrum.js?
By the by, it works fine in MSIE 9, except that when you click on the down arrow, the chooser appears further down the page, instead of in the same place.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.