← Back toFront-end Tips

Indicate img elements that miss alt attribute

Written byPhuoc Nguyen
A11y, Accessibility, CSS
22 Feb, 2021
The following CSS gives a red outline to any img having a missing or blank alt attribute:
img[alt=''] {
outline: 8px solid red;
If you are using Visual Studio Code, you can install the webhint extension. It will automatically detect the issue and show the details when you hover on the element.
webhint image
webhint image

Questions? 🙋

Do you have any questions? Not just about this specific post, but about any topic in front-end development that you'd like to learn more about? If so, feel free to send me a message on Twitter or send me an email. You can find them at the bottom of this page.
I have a long list of upcoming posts, but your questions or ideas for the next one will be my top priority. Let's learn together! Sharing knowledge is the best way to grow 🥷.

Recent posts ⚡

Newsletter 🔔

If you're into front-end technologies and you want to see more of the content I'm creating, then you might want to consider subscribing to my newsletter.
By subscribing, you'll be the first to know about new articles, products, and exclusive promotions.
Don't worry, I won't spam you. And if you ever change your mind, you can unsubscribe at any time.
Phước Nguyễn