The dark chain is also known as the black chain, which is the hidden link hidden links, which is one of the cheating methods of black hat SEO. In the early SEO optimization, the black chain was one of the most effective and quickest methods; but now Baidu algorithm has directly attacked iframe and display:none, etc. If you don’t have any processing on the code, then what you did The outer chain will all be downgraded. Therefore, in the current black hat SEO technology, the dark chain has not been used much, but it is still necessary to understand this classic cheating technique.
The purpose of hanging the dark chain is very simple, increase the external link of the website, and improve the ranking of the website; the implementation methods are mainly divided into several types: implementation by CSS, implementation by JS, implementation by DIV+JS, and other advanced techniques.
If the display property is set to none, this content is not displayed on the page.
Analysis: This form used to be good, and is not recommended now, and is easily detected by search engines.
Set the color color to the same as the background color of the page, and set the size to less than or equal to 1.
Analysis: The link flashed quickly in the form of a horse-drawn lamp. This form used to work well and is not recommended now.
Use js to write css code to the page and set the properties.
Analysis: js output the aforementioned css code, reaching the same effect. At present, Google’s internal meaning of this js-style code is still unrecognizable, but it is not recommended.
Use the div and js functions to modify the properties.
Analysis: This is a common method of combining DIV and JS to do black chain. Spiders generally do not read the contents of the script, only read the links in the div, but the display properties of the div are modified by the script.
Analysis: This method is usually placed under Flash, images or other layer objects. This code is positioned relative to the parent layer, and the child layer is fixed with absolute positioning to block the dark chain content in the underlying hidden layer.
Conclusion: Dark chain is not a new technology, but Black Hat SEO is always on the move, the road is long and far-sighted!
[Black Hat SEO Series] Basics
[[Black Hat SEO Series] Dark Chain] (http://thief.one/2016/10/12/%E9%BB%91%E5%B8%BDSEO%E4%B9%8B%E6%9A%97% E9%93%BE/)
[[Black Hat SEO Series] Web Hijack] (http://thief.one/2016/10/12/%E9%BB%91%E5%B8%BDSEO%E4%B9%8B%E7%BD%91% E9%A1%B5%E5%8A%AB%E6%8C%81/)
[[Black Hat SEO Series] page jump] (http://thief.one/2016/10/10/%E9%BB%91%E5%B8%BDSEO%E4%B9%8B%E9%A1%B5 %E9%9D%A2%E8%B7%B3%E8%BD%AC/)