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linear-gradient
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Method of defining a linear or radial color gradient as a CSS image.

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Flexible Box Layout Module
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Method of positioning elements in horizontal or vertical stacks.
http://css-tricks.com/snippets/css/a-guide-to-flexbox/

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CSS3 Animation
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Complex method of animating certain properties of an element

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::selection
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The ::selection CSS pseudo-element applies rules to the portion of a document that has been highlighted (e.g., selected with the mouse or another pointing device) by the user.

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user-select: none
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Method of preventing text/element selection using CSS.

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background-clip, background-origin , background-size
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New properties to affect background images