Why the audit is important
Every image should have an
alt attribute that includes a text description
of the contents of that image. Screen readers enable visually-impaired users
to use your site by converting text content to forms they can use, such as
synthesized speech or Braille. Screen readers can't convert images. So if your
images include important information, that information is not accessible to
How to pass the audit
Below the audit, Lighthouse displays something like
1 element fails
this test. The number varies depending on how many elements are failing.
Click this label to expand the list. You can find each element in your
DOM by running the
from the Chrome DevTools Console.
alt attribute to every
img element that does not have one.
You can run the following command in the DevTools Console to find the elements:
DevTools returns an array. Expand the array and then hover over each
to highlight it in the viewport.
When writing a description for each image, keep in mind that this is all the information that visually-impaired users have to go by, so try to make it as useful as possible for them.
How the audit is implemented
This section explains how this audit is implemented, so that you can understand how the audit's score is calculated.
This audit is powered by the aXe Accessibility Engine. See Images must have alternate text for more information.