CSS enables the separation of document content from document presentation, for elements such as the layout, colors, and fonts. It can also be used to allow the web page to display differently depending on the screen size or device on which it is being viewed.
CSS specifies a priority scheme to determine which style rules apply if more than one rule matches against a particular element. In this so-called cascade, priorities or weights are calculated and assigned to rules, so that the results are predictable.
Browsers have not been great at reading CSS in the past, but Internet Explorer 9, Firefox 10, Safari, Opera and Google Chrome are fairly good at the implementation of CSS 3.0.
Whats new in CSS 3.0
1. Border Radius
2. Text shadows
Users of Webkit (from Safari 3+), Opera, Firefox, Konqueror or iCab should see a grey drop-shadow behind this paragraph.
3. Box Shadows
Firefox, Safari/Chrome, Opera and IE9 users should see a grey fading shadow under this box.
Users will see this text rendered with the Broadway font, with this part in Broadway Bold.
Development of HTML stopped in 1999 with HTML 4 and was brought back to life when three major browser vendors—Apple, Opera, and the Mozilla Foundation—came together as the Web Hypertext Application Technology Working Group (WhatWG) to develop an updated and upgraded version of classic HTML.
Old elements like <div> remain, but now HTML markup elements include <section>, <header>, <footer>, <nav>, <article> and more. New media elements include <audio>, <video>, <source>, <embed> and <track>. All these new elements are easily learned by simple analogy with elements the designer already understands.
Very importantly, HTML 5 was explicitly designed to degrade gracefully in browsers that don't support it. Browsers now have tabs, CSS, and XmlHttpRequest, but their HTML renderers are stuck in 1999. The Web can't move forward without accounting for the installed base. HTML 5 understands this. It offers real benefits to page authors today while promising even more to page readers tomorrow as browsers are upgraded.
Click here to see how well the browser you are currenlty using measuers up to what what HTML5 offers and also find out which browsers may be better. The HTML5 Studio has fourteen demos that show off some fanciful sides of HTML5 and CSS3, which can be viewed here.
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