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Reveal image alt text

Outlines images and highlights any missing alt text to make accessibility checks easier.

Code to copy

/* Outline images and surface their alt text as a tooltip-style label. */
img {
  outline: 1px dashed rgba(0, 120, 215, 0.7);
}
img:not([alt]),
img[alt=""] {
  outline: 2px solid #d33;
}
img[alt]:not([alt=""])::after {
  content: attr(alt);
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.