Steps to Reproduce

    <listbox  checkmark="true">

1. focus and check the checkbox in the listheader

Current Result

• end-users cannot focus the checkbox with a tab key
• end-users cannot check the checkbox with a keyboard

Expected Result

• end-users can focus the checkbox with a tab key
• end-users can check the checkbox with a keyboard

Debug Information

• it violates WCAG AA level guidelines. Specifically, it contravenes the following criteria:
• 2.1.1 Keyboard (A): This guideline states that all functionality of the content must be operable through a keyboard interface without requiring specific timings for individual keystrokes. If users cannot reach the checkbox using the Tab key, they cannot operate that part of the interface solely through the keyboard, which is a direct violation.
• 2.4.7 Focus Visible (AA): This guideline requires that any keyboard operable user interface must have a mode of operation where the keyboard focus indicator is visible. Since users cannot tab to the checkbox, the focus is never visible on it, making it difficult for keyboard users to determine their location on the page or where their actions will take effect.