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Images missing alt text

A red outline marks images with no alt attribute and yellow marks empty alt — handy for accessibility audits.

Code to copy

img:not([alt]) {
  outline: 4px dashed #CC241D !important;
  background: rgba(204, 36, 29, 0.2) !important;
}
img[alt=""] {
  outline: 4px dashed #D79921 !important;
}

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.