Myelodysplastic syndromes (MDS) | Blood Cancer UK

Side effects | Blood Cancer UK

Life with blood cancer | Blood Cancer UK

Myeloma | Blood Cancer UK

Clinical Trials Information and Support | Blood Cancer UK

Blood cancer treatment planning and types | Blood Cancer UK

Staying safe when you have blood cancer | Blood Cancer UK

When selecting a user interface component with the keyboard, the focus indicator must 
not be completely obscured by anything in front of it.

## Why this matters

When using a keyboard, it is important that the user can see where they are on the page.
If the focus indicator is obscured, the user may not know where they are, and may not
be able to interact with the page.

## Examples

Most common examples include:

* Banners at the top or bottom of the page, such as cookie banners
* Fixed navigation bars
* Fixed footers
* Popup modals, such as cookie consent modals

## How to fix

With elements that cover part of the screen, such as cookie banners, ensure
that the user can scroll to see any content behind the banner, without having to close
the banner.

With popup modals, it should usually be impossible to focus anything behind the modal.
Most common modal frameworks will automatically trap focus within the modal, so that
this is impossible. Example: [Bootstrap Modal](https://getbootstrap.com/docs/5.2/components/modal/#live-demo).

## Further reading

This is part of the draft WCAG 2.2 specification and is subject to change.

* [WCAG 2.4.12](https://www.w3.org/WAI/WCAG22/Understanding/focus-not-obscured.html)

ensure-focus-is-not-obscured-minimum

July 2025

June 2025

Blood Cancer UK

	Title / URL	Issues
	Myelodysplastic syndromes (MDS) \| Blood Cancer UKbloodcancer.org.uk/understanding-blood-cancer/myelodysplastic-syndromes-mds-/	1
	Side effects \| Blood Cancer UKbloodcancer.org.uk/understanding-blood-cancer/treatment/side-effects/	1
	Life with blood cancer \| Blood Cancer UKbloodcancer.org.uk/understanding-blood-cancer/life-with-blood-cancer/	1
	Myeloma \| Blood Cancer UKbloodcancer.org.uk/understanding-blood-cancer/myeloma/	1
	Clinical Trials Information and Support \| Blood Cancer UKbloodcancer.org.uk/understanding-blood-cancer/treatment/clinical-trials/	1
	Blood cancer treatment planning and types \| Blood Cancer UKbloodcancer.org.uk/understanding-blood-cancer/treatment/treatment-planning-types/	1
	Staying safe when you have blood cancer \| Blood Cancer UKbloodcancer.org.uk/understanding-blood-cancer/life-with-blood-cancer/staying-safe/	1

Ensure focus is not fully obscured

Blood Cancer UK

Where this issue has occurred