The Splitter separator has role="separator" attribute. When such a role is set and the separator is focusable, it is required that aria-valuenow attribute is also set. Currently, the Splitter separator does not have such an attribute.

From our point of view, the expected result is - NVDA / Narrator should announce separator value with respect to the position value for the separator (or no separator value at all).

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TELERIK EDIT:

We evaluated this matter and concluded that we will keep the rendering as is. Check the SplitBar section of the Splitter accessibility documentation.