SEO hidden link hanging horse also crazy

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Recently many friends ' stations have been hanged experience, one is made miserable, but there is nowhere to complain. Alas, now the horse is really getting more and more cattle, killing also painstakingly ah. I'm helping my friends with the horse. Accidentally found a very unfamiliar CSS in the code "left:expression (1-900); top:expression (3-999);" And there are countless links to other web sites under it, View in the browser state, incredibly nothing has been found. I immediately remembered a familiar concept: [fervent] hides the link [Strongtell].

Not to say that this is a clever way of writing, at least I saw it before I know expression can use this, of course, you can also laugh at my talents. We all know expression only IE CSS properties, with Hugh Look at the official definition:

IE5 and its later versions support the use of expression in CSS to associate CSS properties with JavaScript expressions, where CSS attributes can be intrinsic or custom attributes of an element. This means that the CSS attribute can be followed by a JavaScript expression, and the value of the CSS property equals the result of the JavaScript expression calculation. You can refer directly to the properties and methods of an element itself in an expression, or you can use a different browser object. The expression is as if it were in a member function of the element.

By definition, I probably know this attribute can be likened to JS functions, and we know that the search engine is now unable to read JS, then we can judge the way the hidden link is feasible? In addition, because it is only IE CSS properties, it is said under other browsers it is not effective, It also means that the hidden will be visible. If this is the case, search engines are more unable to assume that this is a hidden link cheating method, you think?

Because, talk about the SEO in the hidden link content, here to summarize the common hidden link method and its impact on SEO.

1, Display:none

This should be the most common use of CSS hidden links, individuals think the risk coefficient is very high, the use of a reasonable discretion.

2, Text-index: Negative

This is the CSS layout often used in the properties, usually to use the background image to do column name when a supplement. For example, for the sake of beauty, I would like to use a well-designed picture to show

<h2> tags, so this time in CSS I will give H2 write style: {background::url (*.gif); text-index:-9999; So from the perspective of this example, the rational application of this method of a normal Web page layout behavior, will not be punished by the search engine. Attention is reasonable!

3, Left:expression (1-900); Top:expression (3-999)

This one is always clear and does not repeat. Here's an example:

<div style= "position:absolute;left:expression (1-900); top:expression (3-999);" ><a href= "http://www.lonmen.net/" >SEO</a> </div>

4, Line-hight:1px,font-size:0,color=bgcolor

I will not say more of these three ways, for it is tantamount to death. Of course, if you want to do the experiment can be used to play a hand.

5. JAVAScript

It should be said that this is generally considered a safer method. Link-builder.cn has a special introduction, here The method is recorded as follows:

1, Code A

<script language= "javascript" type= "Text/javascript" >bdocument.write ("<div style= ' Display:none;") > "</script></p><div><h1><a href=" "http://link-builder.cn/blog/" >seo</a ></h1></div><script language= "javascript" type= "Text/javascript" >document.write ("</div > ");

2, code two

<div id= "Linksid" ><a href= "http://link-builder.cn/blog/" >SEO</a></div><script> document.getElementById ("Linksid"). style.display= "None" </script><p>

Finally, I would like to say that here about the hidden link method I have no special experiments, please take your own grasp. In addition, the Longmen did not want to advocate black chain meaning ah, just want to further explore the rational use of hidden links and search engine optimization processing.