Search engine optimization seo and exploring the topic
Hiding text by making it too small to read, coloring it to match the background, or covering it with an image or a div block are all frowned upon, and excessive use will cause a page to be penalized. (Legitimate uses of hidden text, such as CSS navigation that hides deive text until the reader mouses over a link, are not penalized. ) To avoid being penalized for unreadable text, make sure all the text on your pages is large enough to be easily legible, colored to contrast with the background, and not inadvertently hidden by another page element. Keyword stuffing is another black hat Seo technique, even more annoying to the user because unlike unreadable text, the keywords are usually visible on the page. The webmaster packs the page title and page body with keywords, sometimes relevant to the page and sometimes completely off the wall.