Restriction IE browser

Thank you.
You are using IE 9.0.
We tested the Gantt chart module.

In firefox there is no problem,
The following error will occur. When the following URL(dhtmlx.com/docs/products/dhtmlxG … basic.html) access in IE 9

“Unfortunately dhtmlxGantt 2.0 doesn’t support IE6 and IE7 browsers.
Please open these demos in different browser or in IE8+.”

The problem is resolved.

IE -> “F12 Developer Tools”
Change “document mode”. IE7 -> IE9

Thank you