alt attribute (i.e.
alt="") indicates that the image is not an important part of the content. Adding an empty
alt attribute is typically done when:
- The image does not convey any meaning (e.g. image is transparent);
- The image does not add anything useful to the document (e.g. image is used as a decoration or a tracking pixel).
<img src="tracking-pixel.gif" alt="" />
In such cases, the user agent may choose to omit/ignore the image, for example, when:
- The image appears broken (because the resource might be unreachable for example);
- The image is unsupported or invalid;
- The image is being interpreted by non-visual browsers (such as screen readers, text-only browsers, etc.) or assistive technologies (such as braille readers, etc.);
- Images are turned off by the user in a visual browser (for example, to save bandwidth or mobile data, for privacy reasons, etc.).
When this happens, the user agent may provide the user with a notification (or some sort of indication) that an image is present but has been omitted from rendering.
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