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This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The -moz-force-broken-image-icon extended CSS property can be used to force the broken image icon to be shown even when a broken image has an alt attribute.

Initial value0
Applies toimages
Computed valueas specified
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar



A value of 1 means that the broken image icon is shown even if the image has an alt attribute. When the value 0 is used the image will act as usual and only display the alt attribute.
Note: Even if the value is set to 1 the alt attribute will still be displayed, alongside the broken image icon.

Formal syntax




<img src='/broken/image/link.png' alt='Broken image link'>


img {
  -moz-force-broken-image-icon: 1;
  height: 100px;
  width: 100px;


ScreenshotLive sample

Note: Unless the image has a specified height and width the broken image icon will not be displayed but the alt attribute will also be hidden if -moz-force-broken-image-icon is set to 1.


  • This property will only work in Gecko-based browsers.
  • The use of this property is not recommended. A proper alt attribute should be used instead.

See also


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 最終更新者: mfluehr,