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Author: NO.1 SEOAlt attribute: an attribute of image tags for the text description of the pictures, when the image link is invalid or mouse over the pictures will be displayed.

Benefits of using the Alt attribute:
1, can help users better understand the meaning of the picture, enhance user access experience.
2, can increase the page keyword density, to improve search results in Google.
3, convenient search engine spiders better understand the pictures in order to give a good image search ranking.

Alt attribute use principles:
One, use the Alt attribute should assist users to better understand the purpose of pictures, add an appropriate description of the text can be, must not be piled up key words, so that there will be black hat to cheat.
2, if the site has many pictures of different pictures to use different Alt attributes must not be stereotyped, or else will be considered a pile of keywords.
3, not all of the pictures are a must to increase, meaning if the picture itself is clear, and after adding keyword density also did not help, you will do to join.

Alt attribute use cases:
Short, succinct, well:
Detailed analysis is recommended:
Malicious pile, danger:

Through the above case, we should be able to learn how to add the Alt attribute it, as long as the user-experience-centric, not for SEO and SEO, then no problem.