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CSS has various levels and profiles. Each level of CSS builds upon the last, typically adding new features and typically denoted [43] as CSS 1, CSS 2, CSS 3, and CSS 4. Profiles are typically a subset of one or more levels of CSS built for a particular device or user interface.
Media queries is a feature of CSS 3 allowing content rendering to adapt to different conditions such as screen resolution (e.g. mobile and desktop screen size). It became a W3C recommended standard in June 2012, [ 1 ] and is a cornerstone technology of responsive web design (RWD).
Many HTML5 and CSS 3 features are already implemented in at least one major browser. [citation needed] Modernizr determines whether the user's browser has implemented a given feature.
Possibly one of the most anticipated features of CSS3, Flexible Box Layout (a.k.a. Flexbox) promises to be an extremely powerful tool for laying out interface elements. WebKit and Mozilla engines have supported a preliminary draft syntax for years. Flexie implements support for that same syntax in IE and Opera.
As of June 2011, Firefox 5 includes CSS animations support. [4] CSS animation is also available as a module in the nightly builds of WebKit as well as Google Chrome, Safari 4 and 5 and Safari for iOS (iPhone, iPod Touch, iPad), Android versions 2.x and 3.x, Internet Explorer 10+ and Microsoft Edge browser, the BlackBerry OS 6 web browser, with the -webkit-prefix.
CSS3 is an abbreviation for Cascading Style Sheets, level 3, a declarative stylesheet language for structured documents. CSS3 may also mean: CSS3, the ICAO airport code for Montréal/Les Cèdres Airport; CSS-3 (also known as the Dong Feng 4 or DF-4), a land-based ballistic medium-range missile of the People's Republic of China
During development, the new CSS framework is initially written in personal CSS, then moved to a Development gadget, which anyone can enable to test the code. Templates will be converted in their respective sandboxes, calling upon the new CSS from the gadget.
The new engine is "designed for interoperability with the modern web" and deprecates or removes a number of legacy components and behaviors, including document modes, ensuring that pure, standards-compliant HTML will render properly in browsers without the need for special considerations by web developers.