User alternate text wherever we have pictures, icons, thumbnails which also helps in SEO and works as image placeholders. Alternatives text is used as a replacement for an image, whenever the image cannot be seen. This can happen, for example, when someone:
- uses a screen reader (e.g. a visually impaired person)
- uses a text-only browser (e.g. browsing from a mobile phone)
- uses a graphical browser with images turned off
- has not yet downloaded the image
- browses results from a Web search
- fails to download the image because of a network problem
- copies an extract from a Web page into a word processor.

