Re : SCRIPT5009: 'DocumentFragment' is undefined

Thanks for fast response.
I'm using IE 11 , need to test my application on IE8, IE9. Some times requirements are that the application must support even IE6 :(

I testing application on IE browsers using only production mode, because using steal it not react, did not found the reason yet.
Seams, its the blockUI issue:
steal("jquery","can","./blockUI.js",function(a,h){"function"!=typeof String.prototype.startsWith&&(String.prototype.startsWith=function(a){return!a||void 0==a.length?!1:this.slice(0,a.length)==a});"function"!=typeof String.prototype.endsWith&&(String.prototype.endsWith=function(a){return!a||void 0==a.length?!1:this.slice(-a.length)==a});"function"!=typeof DocumentFragment.prototype.selectById&&(DocumentFragment.prototype.selectById=function(a){if(this.querySelector)return this.querySelector("#"+a);

Sorry for mislead.

The main thing at this moment for me to find out, why on IE9 (not using modes ) application works only on production mode, and no errors (nothing happens) using steal.