I've configured a Kendo-UI editor so that it supports two tools ("foreColor" and "formatting") (see this DOJO). When the input area is focused, the toolbar can be reached by pressing SHIFT+TAB.

Expected behavior according to the docs: The last-used toolbar item is focused (default: the first item). By pressing SPACE or ENTER, the tool can be activated and used.

Actual behavior (only if the "formatting" tool is present): The "formatting" tool is focused and already activated. Arrow buttons swicth between the different formatting styles instead of selecting the next/previous toolbar item.

Note: When using F10 to focus the toolbar, everything works as expected as long as you don't use TAB afterwards to move the focus back to the input area. The issue seems to be that some container of the formatting tool has its "tabindex" is initially set to "0".