Hidden text is one of the oldest black hat SEO techniques to improve the ranking of a site. The hidden text, which is also known as invisible or fake text, is the content that your visitors can’t see but the search engine can read or see that content.
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Using hidden text to improve the ranking of a webpage is against the guidelines of search engines. The search engines can detect the hidden text in a webpage and treats it as spam and can ban your site temporarily or permanently. So it should be avoided by the SEOs.