Improving Your Tweet Accessibility
Twitter persists. Even if you have moved to Mastodon, Twitter will persist. As such, we need to continue to ensure it is accessible to all users. This post gathers some tips you can and should use.
- Image Alternative Text
- Video Captions
Hashtags on Twitter can be a problem when they are just long runs of all lower-case text. Not only are they hard to read for native speakers, but for non-native speakers of a language they can be impossible to parse. Further, screen readers just plow through them with generally poor pronunciation.
The best rule of thumb here is to essentially use camel case. Capitalize the first letter of each new word. It will be more readable, translatable, and better pronounced in screen readers.
I made a demo using this tweet:
My first time testing mixed case hashtags with screen readers was back in 2010. It was worlds better, but since I generally shunned hashtags I did a poor job of sharing that insight.
Emoji can be problematic for a lot of reasons, some of which I outlined in my post Avoid Emoji as Class Names as well as my post Accessible Emoji, Tweaked. Neither of them deals directly with Twitter, though.
In general, avoid too many emoji. Understand that different screen settings and sizes may make them hard to see, and that different cultural backgrounds (and context) can change their meaning. But beyond all that, they are just verbose in screen readers.
I hid the source of those tweets, because that is not the only account to use 👏 to punctuate every word. It is also an extreme example, but I hope it gets the point across.
It is common to see tweets or Twitter handles with characters you do not find on your keyboard, such as upside-down letters, Old English, or even bold or italic. These are typically Unicode characters (like emoji) which are not announced by screen readers and sometimes not rendered as you expect.
Twitter faux bold / italic PSA (1/2):
Please do not eat the shrimp scampi in the fridge. It is tasty but will kill you.
The Unicode characters that make the bold “do not” and the italic “but will kill you” are not announced in screen readers. A user will hear “Please eat the shrimp scampi in the fridge. It is tasty.” That would be a terrible outcome if the user followed that advice.
The example is not serious, but consider how many people follow official accounts for tornado warnings, traffic alerts, food safety, and so on. If one of the person managing that account uses this faux bold or italic technique to reinforce the more important details of an alert or warning, some set of users will never be aware of it.
Interestingly, this WordPress blog stripped those characters, so if you view the tweet without the Twitter script that embeds the Tweet itself, you would also not see the faux bold and italic. I added plain HTML to make it work.
This is not limited to screen readers and WordPress blogs that embed these tweets.
It's a problem on some devices even for sighted users!
I have an older Android tablet that stopped getting updates after 7.1. This is how that tweet looks on it:
"Please ☒☒ ☒☒☒ eat the shrimp scampi in the fridge. It is tasty ☒☒☒ ☒☒☒☒ ☒☒☒☒ ☒☒☒."
Eric Bailey made a video demonstration how different Unicode text in display names is read by a screen reader.
Image Alternative Text
The last few days have seen more and more folks who are not disabled users, accessibility practitioners, nor adjacent folks promoting the use of alternative text for images on Twitter. This is awesome. I have written about it before and even offered Tweets with plain text instructions.
To try to reduce friction, I am going to show how the screens look to make this all go.
Some quick notes before we get started:
- Twitter only supports alternative text for static images. You cannot add alternative text for videos or animated GIFs. You will need to use old-school techniques, such as a reply tweet, linking to a description, or describing it right in the tweet. I outline more in an old post.
- For testing purposes, I made a bookmarklet to display image alternative text in tweets, but only on the web, and it does not work so well if there is more than one image (the text gets really small).
- To help remind you in case you forget, you can also follow Please Caption!, a Twitter bot that will tweet you when you forget to add alternative text in an image tweet.
Enabling Image Alternative Text on Twitter
I will show you the web interface and an app interface. Bear in mind that these screens change over time, so if you are reading this in the future you may find that stuff is slightly different.
Go to the Profile and settings menu, choose Settings and privacy. From the screen that comes up, choose Accessibility at the bottom of the list (on the left). Check the box Compose image descriptions and press Save changes.
App Interface (Android)
Tap your profile pic to see the menu and choose Settings and privacy. On the next screen, choose Accessibility under the General heading. Check the box Compose image descriptions. There is no save button, so just return to your timeline.
Embedding Alternative Text in a Tweet
Remember, this is not an automatic thing. You need to add alternative text yourself. Here is the basic process now that you have enabled it.
When you are writing a tweet and add an image, you will see a black bar on the bottom of the image with the text Add description. Click that and then type some text on the following screen. Be sure to hit the Apply button. Warning: if you click off the Tweet modal and your tweet goes away, even though it will save your tweet text, it will have lost the alternative text you wrote. So always at least copy it into your buffer just in case.
App Interface (Android)
When you are writing a tweet and add an image, you will see a black bar on the bottom of the image with the text Add description…. Click that and then type some text on the following screen. Be sure to hit the Apply button at the top of the screen. If you do not, your text will not be saved.
If you reply to a tweet with an image, note that you have to hit the Reply button to get the option to add alternative text. If you just respond in the area under the tweet, there is no option to add alternative text.
Writing Alternative Text
On Twitter, Robot Hugs did a great job of giving some examples using a tweet thread. I have embedded some of them here.
you generally don't have to say 'image of' or 'photograph of'. Just describe what the image is conveying – what the user is intended to get out of seeing it. Some examples:
Tweet: Don't worry TO, It's going to get better soon!!
Unhelpful description: Toronto weather forecast
Helpful description: Forecast for Toronto temperatures, showing -18 Celsius today improving to -1 Celsius by Tuesday. pic.twitter.com/wr51uIXp1F
Tweet: Tired of going to conferences where the speaker lineup looks like this
Unhelpful description: headshots of featured conference speakers
Helpful: 8 headshots of featured conference speakers that are all white and male
(Don't @ me, this is to demo intent) pic.twitter.com/VBNgUe4Bjz
Tweet: "U of T's new building has some accessibility issues…"
Unhelpful description: staircase with pillar in the middle
Helpful description: a blind man collides with a large pillar that interrupts a handrail going up the middle of a large staircase pic.twitter.com/PflsInHz04
charts are hard! my attempt:
tweet: We have a new prime number and it’s 23 million digits long
Description: graph showing length of known prime numbers over time, starting at under 10 digits 1588 and increasing dramatically since mid 1900s to over 10 million digits in early 2000s pic.twitter.com/iHUGSU6zbm
trying to conveying the joke/meaning?
description: dogs outside looking around. one dog is looking suspiciously with narrowed eyes at the picture taker.
(if you see your tweet don't feel called out! It's just an example) pic.twitter.com/AxzevuMsq3
so: Don't overthink it. Make it as short as possible while describing what the photo is trying to convey. Any description is better than no description.
Video Captions (added April 3, 2019)
Twitter announced support for captions on videos on Twitter in perhaps the most confusing title possible: Subtitles now available in iOS and Android
Captions have been supported for some time, but the process to provide them has been opaque to authors, and the option to see them has relied on the user’s accessibility settings in iOS or Android. This approach supports all users on Android, iOS, and web. Unless the user expands the video, which makes sense to someone at Twitter.
To do this your Twitter account first needs access to the Media Studio library, or some way to feed the captions into the API. You will also need to ensure your captions are saved in the .SRT format. If you can get that far (copied from the Twitter post):
- Click on a video within your Media Studio library.
- Select the “Subtitles” tab in the pop-up window.
- Select the text language of your subtitle file from the dropdown menu.
- Click the “Upload” button and select the sidecar .SRT file from your local computer.
- The file is now associated with your video. To update the file, click the Pencil icon.
To recap, a general user cannot add closed captions to videos. So you are stuck linking transcripts or embedding open captions in the video.
If you do not have access to Twitter’s Media Studio Library, then you cannot link to a caption file. In that case, your video editing software may offer a way to burn the captions into the video frames. This is known as open captions. Following is an example that I made for Aviation Gin.
If you do this, be careful about text size since users cannot resize burned-in captions. Many people may view your video on a tiny screen at the narrower orientation. Also make certain there is enough contrast with the background. I am a fan of using white text on a black ribbon.
Memes (added January 3, 2020)
Memes come in a variety of formats. The most common is an image with blocky text laid over it. Techniques for embedding alt text in a tweet can generally handle these reasonably well, though in some cases the image is so complex that you need more than 400 characters and you need to provide some structure. I outlined a process in my post Accessible Memes Can Be Done.
ASCII art is also common in memes on Twitter, but it offers no way to provide alt text. This is a case where you are probably better off taking a screen shot of the ASCII art and tweeting that image with alt text. Doing otherwise, as the 2020 meme example below shows, can be incredibly annoying for users.
Others have raised the issue, and there is a Twitter bot dedicated to providing recordings of ASCII art memes. I did the same for this example, but I embedded captions and highlighted the characters being spoken to hopefully make it more visually apparent.
Consider your audience. Consider making your tweets accessible. Now you can have a bigger audience.
These tips generally apply to Twitter user names as well, though you should consider them in profile bios as well.
So you know all those emoji and punctuation marks in your Twitter names get read aloud by screen readers, right? If it takes me longer to hear your Twitter name than to read your tweet? I scroll right on by. Please remember this when adding lots of emoji to things. Thanks.
Similarly, you will see some overlap with being nice over SMS as outlined in Texting Etiquette for Low Vision.
Update: February 21, 2018
An interview with Sassy Outwater at CBC radio: ‘Loudly Crying Face’: Your cute emojis are spoiling social media for blind users
Update: July 15, 2018
The post Listening to Poo, Your Emoji and You discusses how annoying emoji and other special characters can be in Twitter handles.
Update: January 18, 2019
Eric Bailey points out that Twitter’s default themes have terrible color contrast. He has a few tweets with tips.
If you use a custom theme color for your Twitter profile, a nice thing you can do is check to see if your theme color has good color contrast. This will help people experiencing low vision conditions see what in your tweets are links. #a11y webaim.org/resources/cont…
The trick for me is getting a color I like that meets WCAG contrast guidelines for both the white background and surrounding text. #6161FF has a contrast ratio of 4.66:1 with #000000. #6161FF has 4.5:1 with #ffffff (background). Too bad Twitter tweet text is #14171A.
Once again, the easiest and best fix is for Twitter to add link underlines. But you can at least tweak the colors in the meantime.
Update: February 26, 2019
Lindsey Kopacz has recapped most of these in 7 Ways to make your Tweets more Accessible, reinforcing that these approaches help users.
Update: February 27, 2019
We wanted to know if users were adding alt text now. A random sample of public tweets told us: not really. Only about ~1,100 tweets in 1.09 million with photos (0.1%) contained alt text. Maybe this was the wrong way to look at it though, so we tried a few more things: pic.twitter.com/YUv56okBcM
At the end of the thread he outlines some processes that may help increase alt text use, besides Twitter enabling the feature by default.
Update: March 26, 2019
Pro-tip: do not paste the entire text of your tweet into the alt text field for the tweet’s image. twitter.com/mEnablingSummit/status/11102…
Pro-tip: instead of no alt text at all, use any text in the image that is not already conveyed in the tweet. twitter.com/mEnablingSummit/status/11105…
Update: March 14, 2020
This is a great example of an entity partly responsible for disseminating information during a public health emergency. The entire tweet as announced by VoiceOver is
Twitter doesn’t support proper text formatting. Formatted text is created by misappropriating Unicode characters in ways not accessible to all. Don’t do it. This recent three line tweet from @UNGeneva is read as “dart” by VoiceOver on iPadOS. Completely inaccessible. twitter.com/carinemarzin/status/1238… pic.twitter.com/GMiyb14cYg
Hello, thank you for the great information on making Twitter accessible. I was about to Tweet a link to your post about emojis, but realized that there wasn’t audio that matches what the Jaws reading. Would it be possible to include a transcript so the post is accessible to people who are Deaf or rely on captions or transcripts? Thank you for considering. Best, Susan Henderson
Ah, oops. Great suggestion. Will add and comment here when done.
I failed to come back and notify that I added transcripts to the emoji tweet videos.
Thanks! It’s great information. I’m sharing it with our staff.