To reproduce that, go to https://demos.telerik.com/kendo-ui/grid/persist-state
- first, inspect the TH element of the "Contact Name" column, no headers attribute. (screenshot 1)
- then click on "Save State" button and click on "Load State" button.
- now, inspect again the TH element and you will find the attribute "headers"="undefined", on each column actually. (screenshot 2)
Not a big deal but this makes an entry (serious) with the Axe plugin accessibility checker.
Please advise and propose a workaround if any.