6 ms·

Because that’s how screen readers know the image is decorative. It literally is/improves accessibility.

• lghh 4y ago
  Additionally, the developer is more likely to actually write alt text when it's not decorative.
  • Vinnl 4y ago
    Although I must admit, I've also seen such rules leading to developers writing alt text for decorative images, and I'm not sure if that's much better.