alt attribute is still mostly missing, misused or misunderstood what is for. Let me summarise it why
alt attribute is important.
- Adding alternative description of the image is one of the most important principle of web accessibility. This allow users to understand the image context when using assistive technologies, e.g. screen reader.
altcontent is visible while image is loading.
altcontent is visible when image is not available.
altcontent is visible for text-only browsers.
altcontent is important for search engines (e.g. Google, Yandex, Baidu) as it helps to understand the image context. This is related to SEO.
Note: an empty
alt="" attribute tell the assistive technologies to ignore it. It means that the purpose of the image is decoration.