Toolbox is "a semantic, HTML5, canvas for CSS artists and an ultra-minimal set of super-clean templates for your own WordPress theme development."
Designers can use the Toolbox markup to do "anything you want," according to WordPress. You can also use Toolbox to build your own WordPress theme for a self-hosted site.
For those familiar with designing around WordPress themes, Toolbox might strike you as distinctively Sandbox-like -- and you wouldn't be wrong to think so.
WordPress themes shaman and web designer Ian Stewart wrote today on the official WordPress blog, "Much like the Sandbox theme, Toolbox provides all the markup you need to build your very own theme with CSS alone -- with one difference.
"Toolbox uses some really exciting new HTML5 elements -- like