Edited sentence: As such, black hat SEO practitioners consider cloaking to be an important technique to allow webmasters to split their efforts and separately target the search engine spiders and human visitors.Cloaking allows user experience to be high while satisfying the necessary minimum keyword concentration to rank in a search engine.In September 2007, Ralph Tegtmeier and Ed Purkiss coined the term "mosaic cloaking" whereby dynamic pages are constructed as tiles of content and only portions of the pages, JavaScript and CSS are changed, simultaneously decreasing the contrast between the cloaked page and the "friendly" page while increasing the capability for targeted delivery of content to various spiders and human visitors.Increasingly, for a page without natural popularity due to compelling or rewarding content to rank well in the search engines, webmasters design pages solely for the search engines.This results in pages with too many keywords and other factors that might be search engine "friendly", but make the pages difficult for actual visitors to consume