HTML Email and Accessibility

You love HTML emails, don’t you?

As a developer, probably not… but subscribers absolutely do. They devour them, consume them on every device known to man, and drive a hell of a lot of revenue for companies that take their email marketing seriously.

But most web developers tasked with building HTML emails merely want to get them out the door as quickly as possible and move on to more interesting assignments. Despite email’s perennial value for subscribers, tight timelines, and a general loathing of the work result in things falling by the wayside; and, just like in the web world, one of the first things to be set aside in email is accessibility.

I think we all agree that accessibility is a vital topic. Unfortunately, it’s one that’s ignored in the email marketing world even more than on the web.

Accessibility in email doesn’t have to consume a lot of time, though. There are a few simple practices you can build into your own campaigns that will make your emails more accessible and your subscribers even happier.

Accessible Tables?

One of the main reasons that web developers hate building emails is that we’re still stuck using tables for layout in email. Although there are a few different ways to get around using HTML tables, most emails still rely on them to ensure that emails look good in Microsoft Outlook, which doesn’t support more traditional CSS positioning, let alone newer CSS layout techniques like Grid (although that’s possible in email, too).

But HTML tables present a hurdle for users relying on screen readers for consuming their emails. This is made clear when you hear the output of a screen reader working through the typical HTML email campaign. Mark Robbins of Rebel posted an excellent example of this behavior a while back.

The screen reader is doing it’s job: it sees a table, assumes that it contains tabular data, and reads it appropriately.

However, since we’re using tables purely for structural purposes, we need screen readers to ignore those tables. This is where ARIA roles can help us out. By applying the role="presentation" attribute to a table, we can instruct the screen reader to skip over those elements and move straight into the content.

See the Pen Accessible Emails – Tables ARIA Presentation by Jason Rodriguez (@rodriguezcommaj) on CodePen.

With that one simple addition, our emails are much more accessible. It should be noted that nested tables don’t inherit this behavior, so you will have to apply role="presentation" individually to every table in your campaign. Creating a snippet or building this into your email boilerplate is a good way to ensure accessibility without having to even think about it.

Out of the Image and Into the Code

A common practice in email marketing is to use images for everything in the email: graphics, illustrations, copy, links, and buttons. Although this can be efficient (slice, dice, and send it on its way), it’s another huge problem for subscribers relying on screen readers. The typical image-based email has a lot of information that can’t be parsed by a machine. What’s more is that a lot of email clients disable images by default, too. Ever see something like this?

An example of image-blocking behavior in Microsoft Outlook.

We want to avoid or improve situations where content can’t be seen by users or content can’t be read by a screen reader. There are two ways to do this.

The first is to rely less on images and more on HTML to convey your message. Pull copy out of your images and put it into your email as real, live text.

HTML text vs. image-blocking. Lyft does this really well.

HTML text isn’t susceptible to image blocking in email clients, so it will always be shown. Further, most copy that’s typically found within an email can be converted to HTML text. You can style that text however you want, even using web fonts, and your content can be seen by users and understood by screen readers.

This is especially important when it comes to links and buttons in emails. A lot of designers will rely on images for buttons since they can style those buttons however they want. However, those image-based buttons are victims of the same image-blocking behavior as any other image. Using HTML, CSS, and, in some cases, Microsoft’s proprietary VML language, you can create code-based buttons that display everywhere and still fit in with your design.

See the Pen Accessible Emails – Bulletproof Buttons by Jason Rodriguez (@rodriguezcommaj) on CodePen.

The second is to rely on alternative text for images. By adding the alt attribute, we can describe the content of images for screen readers so that users get some context and a better understanding of the email.

The same rules apply in email as on the web:

  1. All images should have an alt attribute
  2. Alternative text should present the content and function of an image
  3. Alternative text should never be redundant
  4. Alternative text relies heavily on the context provided by the content surrounding an image
  5. Decorative images should use an empty alt attribute

A simple example of alternative text in an email would be for something like a retail sale.

See the Pen Accessible Emails – Styled ALT Text by Jason Rodriguez (@rodriguezcommaj) on CodePen.

On top of making our emails more accessible, we can actually style that alternative text so that it better fits in with the rest of our email design when images are disabled. Using things like color, font-family, font-size, font-weight, and line-height allows you to style alternative text in largely the same way you would any other text in the email. Combined with something like background-color on the image, these styles make it possible to have highly-optimized—and accessible—emails for when images are disabled.

Styled alternative text keeps emails accessible and on-brand.

It’s All Semantics

Despite what some email marketers and developers will tell you, semantics in email do matter. Not only do they provide accessible hooks for navigating an email, they can provide fallback styles that help maintain the hierarchy of emails in the unfortunate event CSS isn’t loaded or supported.

It used to be that all text styling was done on table cells within a campaign, with any copy being a direct descendant of that table cell.

See the Pen Accessible Emails – Old Text Approach by Jason Rodriguez (@rodriguezcommaj) on CodePen.

Email developers would avoid using semantic elements like headings and paragraphs because email clients (correctly) displayed their own default styling of those elements, which sometimes resulted in broken layouts or unintended designs. I don’t know if it was sheer laziness or something else, but very few developers would use semantic elements with simple overrides to keep their designs accessible and consistent across clients.

Adding the margin property on block-level semantic elements—and relying on style inheritance from the table cell—can create more accessible emails that display properly nearly everywhere.

See the Pen Accessible Emails – Semantic Text Approach by Jason Rodriguez (@rodriguezcommaj) on CodePen.

You don’t have to stop at simple headings or paragraphs, either. You can use sectioning elements like main, header, footer, article and more to provide extra semantic value to your emails. I would caution you to use them on top of your existing table-based structure, though. Not all email clients support styles being applied to those elements, so something like this is a good approach:

See the Pen Accessible Emails – Semantic Article by Jason Rodriguez (@rodriguezcommaj) on CodePen.

Designing for Subscribers

The last technique I want to discuss—although not the last technique available to us—is adhering to tried-and-true design principles within our campaigns to keep them accessible.

Accessibility isn’t all about screen readers. Subscribers can have visual impairments as well as physical or cognitive disabilities that make consuming emails difficult, especially when an email’s design hasn’t been updated in years. By relying on design principles like hierarchy, space, pattern, proximity, type size, and contrast, we can ensure that a broad spectrum of subscribers can understand and enjoy our email campaigns.

This is especially apparent when it comes to viewing emails on mobile devices. If you’re not taking the mobile view into account from the outset, or using responsive email design, then your desktop-first email campaigns can be a pain to use when scaled down on most mobile email clients.

Trello uses large visuals, type, and buttons to keep things readable and usable across all device sizes.

Simply revisiting your designs with mobile and disabled users in mind can go a long way to keeping your emails accessible. Using larger type that’s legible for a wide variety of users, combined with proper heading styles and a hierarchy that is easy to scan is a great baseline. Adding in repeatable patterns within your emails that further aid scanning and understanding, along with plenty of white space and properly contrasting colors take your emails even further.

I encourage you to use tools like Chrome Lighthouse and Accessible-Colors.com to check the accessibility of your HTML email designs. It’s all HTML and CSS, so the same tools that work on the web work on email as well. Use them!

Have Your Own Tips?

Although a lot of email development is stuck in the past, that doesn’t mean we can’t modernize our campaigns right along with our websites. Many of these tips can be baked right into your email boilerplate or code snippets, allowing you to create more accessible HTML emails without too much thought.

At the same time, don’t let that stop you from putting that extra thought into your emails. This article merely scrapes the surface of what’s possible in HTML email development. I’d love to hear about your tips for building accessible emails in the comments below.


HTML Email and Accessibility is a post from CSS-Tricks

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