When you pre-compile your jade templates for the browser, interpolated locals will still require jade.escape, but it's a simple fix, and here it is!

jade_shim.js

// this is required in order to properly escape
// jade interpolation
jade = {
  escape: function(html){
		return String(html)
		.replace(/&/g, '&')
		.replace(/</g, '&lt;')
		.replace(/>/g, '&gt;')
		.replace(/"/g, '&quot;');
	}
};