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="").
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.
6， Not that I know of. My source came from some research one of the SEO forums did some time ago. I don't remember where. There was some mathematical evidence that demonstrated that backed up the conclustion somewhat.
My point was it is a good idea to use them anyway even if Google doesn't pay attention to them.
7， I read somewhere, and I am pretty sure it was in this forum, that using ALT tags with keywords was a benefit. I didn't hear anything about it being ignored if it wasn't a link. I'd like to know that as well!
8，i recently done a course on website optimisation through isis (learndirect), the teacher said that google will read alt text as it doesnt understand the image file when it is indexing sites. i dont know for sure if this is correct but all the other advice i got on the course was excellent so i think he was probaly right.
9，The question isn't if google will read alt text. It's if it puts any weight on alt text on images with no link. Google can read meta tags, but it doesn't mean that they do any good.
I'm going to use them anyway, it won't hurt anything.
10，if google reads the alt text, will it not consider it the same as content text and use it to find keywords, or keyword relavence to meta tags???????
11，Google ignores meta tags. And no, it won't consider alt text the same as body content text. It will not carry nearly as much importance as actual body content.
12，(M) I agree it is good to use them either way. Everything is not for Google (-:
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