This Gatsby post was written for Gatsby 3 and is no longer maintained. If you would like to try out SvelteKit or Astro, check out the maintained posts which are based on those. Astro lets you continue to use React but also with partial hydration which can be used to provide an enhanced user experience. SvelteKit offers server side rendering as well as static site generation. See the post on how performance improved switching from Gatsby to Astro for more background.
We focus on quick and easy Gatsby site accessibility gains in this post. Although we have a Gatsby focus, most of the tips can be borrowed for use with other tools. Svelte in particular, like Gatsby, has good built-in accessibility support. Why is it important to make sites as inclusive as possible? To start, one in four people in the United States has a disability. Closer to home, one in every ten people in the UK has some degree of dyslexia. If you fail to cater for this minority, you are making a decision to reduce significantly your audience. On top many accessibility improvements provide a better user experience for all users of your website. If that alone does not get you interested, remember, user experience is important to Google. It is a key gateway to ranking on the Google search engine results page.
Speaking from personal experience, it is not easy to get going on accessibility. I came at it with no experience of using assistive technology. I found advice could be contradictory. As an example, I came across pieces suggesting only serif fonts should be used in paragraphs. Then others suggesting only sans-serif should be used.
Thankfully there is much information available and for the most part, it is not so contradictory.
Despite that, an element of balance is needed. Let's consider contrast as an example. For the
partially-sighted, a decent level of contrast between text and background helps improve
legibility. However, dyslexia expert Lauren Garden points out that high contrast (e.g. black text,
#000, text on a pure white,
#fff, background) can trigger visual
distortion for dyslexia sufferers
The hope for this piece on quick & easy Gatsby site accessibility gains, is not to be a definitive guide. Instead it is something to help you dip a toe in the accessibility pool (so to speak). If you are keen to do your bit, but not sure how to start, this post should get you going on the right track.
As this post is written for developers, let's jump in at step zero! If you are not new to
accessibility, you can probably skip this step and go straight on to the next one. You might
already know that it is important, for accessibility, to include an
alt tag on image elements. This is so that visitors using a screen reader can get an idea of what an
image is about. Equally important, when you use decorative images, still include the alt tag but set
it to an empty string:
Alternatively, if you're using the new new Gatsby Image API:
We are creatures of habit; if you make a conscious effort to add the
alt attribute to image tags it will soon become second nature. Once you have mastered that, move on
aria-label attributes into your links and making sure iframes
title attribute. Like the
alt attribute on an image, this helps screen reader users understand the topic of the content. Remember
if you copy
iframe code from YouTube, to paste in a
You can also add an aria-label on Gatsby
<a /> component.
One trick I use is to put accessibility attributes first in any element. This makes it stand out whenever I forget to include one. Now we are out of the blocks, let's get on to the main three Gatsby site accessibility quick gains.
This is probably the easiest of all the steps. In addition, it is not too much work to get the
score up to 100. There are a couple of common issues which are quite easy to fix. Firstly you
might get a warning that the page does not have a
[lang] (language) helps assistive technology choose the best pronunciation
Just change the code to match the correct tag for your own site's language
The other common Lighthouse issue is contrast ratio. Here, you should only pass the test if your
text stands out from the background. As mentioned earlier, this can help partially sighted people
have an easier time reading your content. Aim for a score of 4.5 or higher to meet recommended colour contrast standards
You can run Lighthouse in Chrome or alternatively use the Google Page Speed tool
ES Lint is a tool which you can set up to scan your code for errors as you type. If you are not already using it, I would highly recommend it. It will save you a lot of time when you have a silly typo in your code. That aside, to get going on accessibility you just have to add and set up the a11y extensions. Then, ESLint lets you know if it ever thinks your code is not in line with accessibility best practices.
There are various ways to get it up and running. I find the easiest way is to install the ESLint plugin and then to do an interactive setup. To start, jump to the project folder in the terminal and then type the following command:
Then start interactive setup (make sure you have a package.json file in your project folder first):
This will create an
eslint.js file (or equivalent yml or json file
depending on the options you choose) in the project directory. Just edit this file to include the a11y
options below. That completes the accessibility part of the setup. You can tweak settings but, to get
going, I would suggest you stick with the recommended settings as below.
If you are using VSCode, install the ESLint extension by Dirk Baeumer
Although Lighthouse reports on Accessibility, you should also run a tool focussed on testing accessibility. I suggest you pull the tests into your development continuous integration (CI) workflow. This is because, typically, you will have an initial sprint to make accessibility improvements. Once those are in the bag, you will probably turn to unrelated fixes and enhancements. Over time, without a conscious effort (and even with good intentions), you can break accessibility. If you integrate testing into your work flow, you get feedback whenever you break accessibility. This way you reduce the workload for keeping the site accessible. On top you maintain accessibility throughout.
Deque have developed the axe suite of accessibility testing tools. Set up the axe Chrome browser plugin
Once set up, keep Cypress running as you develop. You will get accessibility errors whenever you do something to break accessibility. Using Artem's setup, you will see when there is an error in the Cypress UI. A list of errors is also printed to the terminal. It might be tricky to work out how to remedy the error, or exactly which element is causing it. This is where the axe browser extension helps. Once you have it installed, it creates a new tab in Chrome Developer Tools. From there you can trigger a test run. It gives more verbose details of errors and on top, you can have it highlight the offending elements.
If you really want a third opinion, try another Chrome Extension: the WebAIM WAVE tool
Get feedback from site users. The automated tests are pretty good. That said, it can be difficult to know what the experience is like for real-world users without asking them. They might be able to suggest further simple changes to assist those with disabilities you had not thought of. And don't forget, typically these changes will improve the user experience for all site users.
I hope you have found this post a useful starter on your journey to building Gatsby sites with improved accessibility. Feel free to share it on your social media accounts for all your followers who might find it useful.
Do you use a screen reader or have any accessibility requirements yourself? If you do I am keen to
hear your thoughts on the website and any improvements I could implement. Also if anyone has more
accessibility ideas or even alternatives, I would love to hear your thoughts. Tell me how you
extend on what is included in this post too. Let me know via @askRodney