Supply and pressure | Tap water | My Supply | Severn Trent Water

Businesses | Severn Trent Water

My water quality | My Supply | Severn Trent Water

Overview | Building and Developing | Severn Trent Water

How to report a death | My Account | Severn Trent Water

Login | Severn Trent Water

Check my area | In My Area | Severn Trent Water

Payment plans | Payment plans | My Account | Severn Trent Water

My water meter | My Account | Severn Trent Water

Our Visitor Sites | Severn Trent Water

Form controls must appear sufficiently distinct from their surroundings, so that people 
with visual impairments are still able to clearly see them.    

Either the border or the form control itself must have a 3:1 colour contrast with the 
surrounding area. 

## Methodology

* All `<input>`, `<textarea>`, and `<select>` elements are checked.
* For `<input>` elements, these types are ignored as their
  appearance is controlled by the browser or operating system:
  `checkbox`, `radio`, `submit`, `reset`, `image`, `hidden`, `file`. 
* The flattened background color of the control is determined. This is the color of the
  control itself, combined with any parent elements if the control is transparent.
* If the control has a border or outline:
  * The flattened background color of each edge is determined. 
    This is the color of the edge itself, combined with any parent elements
    if the edge is transparent.
  * If any edge has sufficient contrast with the flattened background color of the control, 
    the control is considered to have sufficient contrast.
* If the control does not have a border or outline:
  * The flattened background color of the surrounding 
    area is determined. This is the color of the first control's parent element which is at least 
    one pixel larger around the element in every dimension, i.e. above, below, left, and right.
  * If the background color of the element has sufficient contrast with surrounding area color
    the control is considered to have sufficient contrast.

## Troubleshooting

There are some limitations to the contrast checker:

* The use of drop shadows, glowing effects, gradients, and other complex effects 
  mean there is no one clear color to determine the contrast ratio against. 
  In these cases, the contrast ratio cannot currently be determined.
* It is possible for an element to be positioned over multiple elements, e.g. via
  `position: absolute` or `position: fixed`. In this case, the contrast ratio cannot 
  currently be determined.

## Further reading

* [WCAG 1.4.11](https://www.w3.org/WAI/WCAG21/Understanding/non-text-contrast.html)

non-text-contrast

January 2025

December 2024

Severn Trent Water

Title / URL	Issues
Supply and pressure \| Tap water \| My Supply \| Severn Trent Waterwww.stwater.co.uk/my-supply/tap-water/supply-and-pressure/	1
Businesses \| Severn Trent Waterwww.stwater.co.uk/businesses/	1
My water quality \| My Supply \| Severn Trent Waterwww.stwater.co.uk/my-supply/water-quality/	1
Overview \| Building and Developing \| Severn Trent Waterwww.stwater.co.uk/building-and-developing/overview/	1
How to report a death \| My Account \| Severn Trent Waterwww.stwater.co.uk/my-account/how-to-report-a-death/	1
Login \| Severn Trent Waterwww.stwater.co.uk/login/	1
Check my area \| In My Area \| Severn Trent Waterwww.stwater.co.uk/in-my-area/check-my-area/	1
Payment plans \| Payment plans \| My Account \| Severn Trent Waterwww.stwater.co.uk/my-account/regular-payments/payment-plans/	1
My water meter \| My Account \| Severn Trent Waterwww.stwater.co.uk/my-account/my-water-meter/	1
Our Visitor Sites \| Severn Trent Waterwww.stwater.co.uk/our-visitor-sites/	1

Ensure form controls contrast sufficiently with their surroundings

Severn Trent Water

Where this issue has occurred