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Concept
Ligne de flottaison (informatique)
Résumé
Above the fold is the upper half of the front page of a newspaper or tabloid where an important news story or photograph is often located. Papers are often displayed to customers folded so that only the top half of the front page is visible. Thus, an item that is "above the fold" may be one that the editors feel will entice people to buy the paper. Alternatively, it reflects a decision, on the part of the editors, that the article is one of the day's most important. By extension, the space above the fold is also preferred by advertisers, since it is the most prominent and visible even when the newspaper is on stands.
The term can be used more generally to refer to anything that is prominently displayed or of highest priority. Above the fold is sometimes used in web development to refer the portions of a webpage that are visible without further scrolling or clicking. In contrast, portions available via clickthrough are sometimes described as "after the jump".
Above the fold is also used in website design (along with "above the scroll") to refer to the portion of the webpage that is visible without scrolling. As screen sizes vary drastically there is no set definition for the number of pixels that define the fold. This is because different screen resolutions will show different portions of the website without scrolling. Further complicating matters, many websites adjust their layout based on the size of the browser window, such that the fold is not a static feature of the page.
A 2006 study by Jakob Nielsen found that 77% of visitors to a website do not scroll, and therefore only see the portion of the website that is above the fold. In a more recent article by Amy Schade and NNgroup it is stated that there is an 84% average difference in how users treat the content above and below the fold, there is a big dropoff in attention below the fold. Most web design advice available today encourages designers to place important information at the top of the website, but also to prioritize usability and design.
Source officielle
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