Example parsing alt tag SEO effect

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Often see a lot of beginners in the current picture of the value of the Alt attribute is also SEO effect? Does the picture use the title also need to use the ALT tag? If the ALT attribute has no effect, we can not set it, because canceling the ALT attribute value can reduce the amount of time a Web site editor or developer has. Then this article will be on these issues, through examples to explain the meaning.

First, verify that the search engine is able to identify the ALT attribute well

We first take an electronic website as an example, the author found a picture page with ALT attribute. The picture is an electronic price trend chart, alt attribute value is: "Huaqiang North Electronic market price index week trend". View the source code of the page and find that this is the only Alt value that contains this word. The author uses the spider Simulation tool in Webmaster tools to crawl the page and finds that the word is not found in the crawling results. As shown in the following figure.

This can not help but let the author create doubt, however tastes alt attribute value without any effect, even search engine spiders are unable to recognize. Later in-depth analysis also feel not bizarre, because at this stage we know that the search engine is not very good to identify the picture, can effectively identify the picture information to which the bottom we are still unknown. At the same time as a webmaster tool, we can only be used as reference data, and can not define the results.

So I decided to find the answer from search results of search engines themselves. Finally let the author find a good case, first of all, as shown in the following figure,

We can see this picture has no doubt been included in the search engine. Then we'll take a look at the Alt attribute value of this picture. Looking at the source code, we can find that the Alt attribute value of this picture is: "Bedroom _1780x1024 click Browse Next: Kitchen", try the following figure

Then we search the search engine for this alt attribute value of the word, the author is used Baidu and Google two more authoritative search engines. The results are shown in the following figure

The following is a brief analysis of this result. One: we can see from the results of the test as a search engine, whether Baidu or Google will use the ALT attribute value to determine the type of picture, alt attribute value in the site's SEO still plays an important role. Second: We see the results of Baidu's search results are many, some irrelevant, and the correct demerit line in the four, Google's search results only three, the correct results in the first, so we can see that Google in the image retrieval is still better, The Alt attribute value is also more valued. The above is from the classic quotations http://www.52wz8.com/for the alt attribute of several views, hope for everyone to help.