<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Responsive web design (RWD) is an approach to web design which makes web pages render well on a variety of devices and window or screen sizes . Recent work also considers the viewer proximity as part of the viewing context as an extension for RWD . Content, design and performance are necessary across all devices to ensure usability and satisfaction . </P> <P> A site designed with RWD adapts the layout to the viewing environment by using fluid, proportion - based grids, flexible images, and CSS3 media queries, an extension of the @ media rule, in the following ways: </P> <Ul> <Li> The fluid grid concept calls for page element sizing to be in relative units like percentages, rather than absolute units like pixels or points . </Li> <Li> Flexible images are also sized in relative units, so as to prevent them from displaying outside their containing element . </Li> <Li> Media queries allow the page to use different CSS style rules based on characteristics of the device the site is being displayed on, most commonly the width of the browser . </Li> </Ul>

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