关于图片ALT属性的SEO原则总结

Does the alt for a non-linked image is ignored by Google? If so, I will not trouble to optimize the alts for non-linked images on my page.
Thanks in advance.
Ethan
- www.ihelpyouservices.com有一个回复，是Moderator的回复，内容如下：
1,(M) Yes, that’s true, at least right now. Google only indexes the alt attribute of linked images. But that doesn’t mean you should leave the alt out of non-linked images. Just use if for its real purpose: to describe the image for people who can’t see it.
In the case of images that only serve the purpose of creating space, you can add an empty alt attribute (alt=““).
- www.highrankings.com有两个回复，其中一个是Jill的回复。Jill是美国最著名的几个SEO专家之一。
1，I think the general consensus is that engines ignore them but I’d still put them in anyway- not optimised but for accessibility.
2，(Jill) Yes, you are correct, they are ignored by the search engines. Alt attributes aren’t really an SEO technique, they are a design concern.
- www.webproworld.com有12个回复，其中两个是Moderator的回复。
1， I doubt whether the image is linked matters. IMO the text will still count......probably not much though.
2， I’ve heard that it doesn’t count at all, but it is text so I suppose that it counts a little. Most likely very little.
3， I’ve heard it bounced around some other forums that Google will ignore alt text without a link. However, it is still a good idea to use them in case the image doesn’t load, accessibility, etc; and the fact that Yahoo probably doesn’t ignore them.
4，(M) Is there any proof that Google will ignore it if there is no link?
5, Google states in their guidelines to use proper web design methods to have good code in your pages. Using an alt tag on images is something you do for accessibility, like achronister pointed out. Site readers used by blind people scan the alt tags and the speaker reads the text to them so blind people know what the images are there for. It’s just a good practice to get in to.