In this article, I'll point out the 5 most common mistakes related to web accessibility and share ideas about how you can cope with them.

Table Of Contents

• No semantic HTML
• Ommiting alt tag
• Lack of labels
• Too low contrast ratio
• No keyboard navigation support

01. No semantic HTML

Using tags like <section>, <article>, <nav> or <aside> make your site much more accessible right on the starting point. Thanks to that, screen readers used by blind people can clearly recognize the purpose of different parts of the website. Tags like <div> or <span> haven't any informative value and make your content much harder to interpret.

A quick win for your app is using proper heading hierarchy.
It's common that beginning developers think about heading tags (<h1>,<h2>,...) in size category. But it's not the point! Heading tags are not about the size or design property, they are about the priority of the text. If your text needs to be bigger just use CSS to achieve that.

Also, you shouldn't skip heading levels. Start from <h1> then <h2>, <h3> and etc.

02. Omitting alt tag

Remember, every img should have alt property. That makes photos accessible.
The rule is simple there. If the image is just a decoration element without any content message the value of alt should be an empty string. In another case, alt should have a descriptive description of the image.

Tip: Don't write 'The image presents...' or 'In the photo...' in the alt text. The screen readers already have known that's an image.

03. Lack of labels

People need labeled inputs to know what kind of information they are supposed to provide.

Some people use the placeholder value to tell the user what the input is for. It's not the best idea when it comes to a11y. Firstly, some screen readers don't read placeholder value at all. Secondly, it's just a bad UX. When the user starts typing the placeholder value disappears.

04. Too low contrast ratio

If the element's contrast ratio between background and foreground is too low people with vision disorders just can't see the content.
The interesting fact is that it's very important even for your average users, for example on a sunny day it's almost impossible to capture low contrast elements.

If colors fail audit you should consider changing the palette to make your element accessible.

Tip: You can check contrast ratio using this tool https://whocanuse.com

05. No keyboard navigation support

Sometimes users want to navigate your site using a keyboard only. You need to make their life easier.

Never remove the outline from the focused element if you don't provide any alternative styling (box-shadow, background, border).

What's more, your focus order can't behave unpredictably. The order of focus should be consistent with the reading direction in the user's country. You can use negative z-index value to make some elements unreachable from a keyboard (eg. emojis) but be aware of messing focus order up.

Thanks for reading, I hope those points will point your attention to some web accessibility issues.

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