Interaction Designer

As an Interaction Designer, you play an important part of making sure a service or website is accessible.

Making screens and interactions simple makes things easier for everybody. Overcomplicated designs or using inaccessible design patterns can have a knock-on effect when it’s time for developers to code up your designs.

If you want to see how your designs test with assistive technology, you can use our assistive technology testing templates

Things to consider as an Interaction Designer

1 thing per page

If you need to ask questions in your service, always start with 1 thing per page rather than using multiple fields and conditional reveals.

Use the GOV.UK design pattern for question pages.

Keeping the content of pages simple is one of the easiest ways to make them accessible. 1 thing per page is less disorientating for users and reduces the cognitive load.

Read more about 1 thing per page .

Alternative text for non-text content

For images, consider if they’re meaningful or decorative. Do they add context or are they purely decorative?

If an image is meaningful, you must provide alternative text. This means somebody who cannot see the image can still understand what the image is showing.

For example:

<img src="cat.jpg" alt="A cat wearing sunglasses." />

You should work with a Content Designer to make sure your alternative text is clear and simple.

If an image is purely decorative, you should work with a Frontend Developer to make sure it is hidden from screen readers.

Announce dynamic content

If the content of a page changes dynamically, such as a pop-up or using live data, you must announce the changes to a screenreader.

Work with a frontend developer to make sure that dynamic content is announced using the right aria attributes.

Conditionally revealing content

Conditionally revealing content has been possible for a while. But in September 2020 GDS found that sometimes the expanded content was not read out to screenreaders. You can read more about the problem with conditionally revealing content on the GOV.UK Design System Accessibility Statement.

When conditionally revealing content, do not nest multiple reveals inside one another. This can very quickly become disorientating. If you must use conditional reveals, keep them simple like the example given on the Radio Button Component .

Conditional revealing content can also create scenarios where the heading of the page loses it’s context. If you must use conditional reveals make sure that the fields all still make sense in the context of the H1.

Do not rely on sensory characteristics

Do not design anything which relies solely on one of your senses. For example, “The button on the left” implies that the user can see and can decipher left from right. In reality, they could be blind and using a screenreader so cannot know which button you are referring to.

Another example is “Use the green button for yes and the red button for no”. If your user is red/green colour blind then both buttons may look the same.

For any content, make sure there is more than 1 way to obtain the information. If it’s an image, provide alternative text. If it’s audio, provide a transcript. If it’s a video, provide subtitles etc.

For any link, remove everything else on the page and make sure it still makes sense. For example “Change” is not clear when you view it in isolation, but “Change bank details” is.

If you need to, you can use visually hidden text to add context to a link. This is text which is still read out by a screen reader but cannot be seen on the screen. For example:

<a href="#">
  Change <span class="govuk-visually-hidden">bank details</span>

Never use a link which tells the user to “Click here”. The word “click” makes an assumption that a mouse is being used, but the user could be using a keyboard or some form of assistive technology.

You should work with a content designer to make sure your links make sense both in and out of context.

Logical reading order

The most obvious way to do this is to keep pages simple and make them read top to bottom.

If you must use columns or complex layouts, make sure that the reading order is still logical and that it still makes sense reading it top to bottom on a mobile device.

Links and form elements should also follow a logical order when using the tab key. If you tab through the page and the focus is missing or moves around the screen in an unpredictable way, this will fail WCAG 2.1.

Minimise visual stimulus

The design should be simple and free from unnecessary visuals.

Before using icons and images there should be clear evidence from your user research that they are needed. We shouldn’t be trying to make things look cool or modern at the expense of making things simple.

Start with existing patterns and components

When designing a new service, always start with what is available already. Check the GOV.UK Design System and the DWP Design System before designing anything new because those patterns and components have already been researched and tested to make sure they’re accessible.

If you design anything new, your team will have to do all of the user research and accessibility assurance work to make sure that it is meeting the needs of your users and the accessibility standards.

If your service is only for staff or if won’t be GOV.UK branded, it is still recommended to use the GOV.UK Design System and its unbranded layout. You will still get the benefits of the accessibility work that has gone into it. For example resizing the screen, the line spacing and the components.

Summarise charts and graphs

For charts or graphs, you should summarise what the chart is showing and provide the data you used to generate the chart. This means people who can’t see it can still easily understand what it is showing, but can also access the raw data if they want to look at it themselves in more detail.

For example:
This chart generated from Office for National Statistics data shows that from 1980 to 2020 the number of families in the UK who own a dog has risen from 1 in 20 to 1 in 4.

You should work with a data analyst to make sure the chart, the data and the summary all align.

Unique headings

Every page should have a unique heading. Don’t have multiple pages with the same vague H1, for example: “Your details”.

Think about the journey as a whole. Consider the page that came before or the one that comes after.

If a screenreader user submits some information on one page, but the heading on the following page is the same, they may think the page has not changed, even if it’s obvious to a sighted user that it has.

Use of columns

The use of columns should be carefully considered. If you need to have a sidebar, consider how it might be for users who are blind or who use a screen magnifier. Will they be able to find it easily?

When using a sidebar, consider how it will work on a screenreader, or on a mobile device when all the content reflows. Should the sidebar or the content be displayed first? And if the sidebar is repeated on multiple pages have you considered a way to skip over it?

Links are often styled to look like buttons, but this can make things difficult for people who use speech recognition software. It can also make it difficult for users to know what to expect when they click on both of these elements.

As a general rule of thumb, a link should just navigate between pages and buttons should interact with data. Ask yourself; “if I click this button, am I submitting a form or deleting a record?” And if the answer is no, then it probably should be a link.

If you do need buttons, don’t use more than one green button per page. The green button should be the primary action. Any secondary actions should use grey buttons. Destructive actions such as deleting a record should be red.

You can read more about buttons in the GOV.UK Design System.

If you absolutely must style a link to look like a button, then make sure it is assigned the role of button. An example of this is the Start Button component.

Use sufficient colour contrast

Make sure the colour contrast is sufficient between text and surrounding elements. It should be 4.5:1 for normal text or 3:1 for large text.

Large text is anything over 18pt, or bold text which is larger than 14pt.

Normal text is anything under 18pt and is not bold.

Don’t use a font size less than 14pt. You can read more about font sizes in the GOV.UK Design System.

Use up to date styles

Using out of date styles means you might not be meeting the current standards. The GOV.UK styles were updated in GOV.UK Frontend 3.0 to meet the WCAG 2.1 standards. If you’re using the old styles your service will not be compliant.

Example of old GOV.UK focus styles.
Old GOV.UK styles
Example of new GOV.UK focus styles.
New GOV.UK styles

You can read more about the updated GOV.UK styles in the following GDS blog post: We’ve made the GDS Design System more accessible .