Hello
Is a page with the dhtmlxgrid touch enabled on a tablet by OS default?
Unfortunately your issue is not clear.
dhtmlxgrid does not support the touch.
you may use the dhtmlxTouch functionality.
Sorry let me state it this way
Would a webpage with dhtmlxgrid on an OS that is touch enabled(Win7, Win8) on a tablet be also touch enabled?
dhtmlxgrid is not designed for the touch devices.
Please, try to check some online samples:
dhtmlx.com/docs/products/dhtmlxGrid/samples/
For touch devices you may try to use the dhtmlxTouch:
dhtmlx.com/touch/
or the Webix datatable:
webix.com/widget/datatable/