reddit flair modal Add button: UIA-invisible, CDP trusted click fails, only physical click works

Reddit flair modal dialog buttons (Add, Cancel) are NOT exposed in UIA tree. Only the X-close button appears as UIA Button. a11y click falls back to WM_LBUTTON PostMessage which Chrome modal ignores. CDP eval-js querySelector click also fails (isTrusted=false). Only SendInput physical click works. Workaround: select radio via UIA (aid=post-flair-radio-input-N), then user clicks Add manually. X-button UIA pos offset to Add button: approx -3px X, +418px Y.

Steps