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Documentation of accessibility observations for Deutsche Telekom – Mobilfunk & OneShop

2.4.11 Focus Not Obscured (Minimum) (AA) Dialog windows and fixed content obscure focus of underlying elements

Priority: Critical High Page: Xiaomi 15 Observation Permalink
Accompanying Files
Observation Details

Open dialog windows can obscure focus of underlying interactive elements. Obscuring can be partial or complete. This will impact users of keyboard navigation as focus cannot be tracked while a dialog window is open. Dialog windows triggered by:

  • Footnotes

Fixed content:

  • Bottom bar in "Tarif ändern" dialog window obscures multiple focusable elements

  • Zahlungsinformation in sidebar fixed; links in collapsible (info icon)

Remediation Notes

When opened,

  • dialog windows must receive keyboard focus and

  • keyboard focus must be trapped inside the dialog window.

Ensuring placed and trapped keyboard focus to the opened dialog window will remediate this issue, as no interactive element outside of the opened dialog window should be focusable, thus cannot be focus obscured.

For more information about technical requirements of modal dialogs, refer to BFIT-Bund Handreichung "Accessible design of user interface elements – Modal Dialog". Also, consider/evaluate use of HTML dialog element <dialgo>. See HTML specifications – The dialog element and Can I Use – Dialog for browser support information.