归纳最全的CSS2和CSS3区别

　　在 CSS3 中为 CSS2.1 新增的取值，下面是每个属性新值的列表。

• Value “local” for the background-attachment property
• Value "rgba()" for any property that accepts a color value
• Value "hsl()" for any property that accepts a color value
• Value "hsla()" for any property that accepts a color value
• Value "currentColor" for any property that accepts a color value
• Value "inset()" for the clip property
• Value "linear-gradient()" for any property that accepts an image value
• Value "radial-gradient()" for any property that accepts an image value
• Value "repeating-linear-gradient()" for any property that accepts an image value
• Value "repeating-radial-gradient()" for any property that accepts an image value
• Value "image()" for any property that accepts an image value
• Multiple comma-separated images for any property that accepts an image value
• Multiple comma-separated background-related values to match multiple background image declarations
• Value "center" for the position property
• Value "page" for the position property
• Value "space" for the background-repeat property
• Value "round" for the background-repeat property
• 15 new values for the cursor property
• Values "flex" and "inline-flex" for the display property
• Values "all-small-caps", "petite-caps", "all-petite-caps", "titling-caps", and "unicase" for the font-variant property
• Multiple, space-separated values for the letter-spacing property
• New values for the text-align property, including "", "match-parent", "start", "end", and "start end"
• text-decoration is now a shorthand property
• Keywords "hanging" and "each-line" declared along with length or percentage values for the tfext-indent property
• Value "full-width" for the text-transform property
• rem units for lengths
• calc() units for lengths
• toggle() units
• Angle units (deg, grad, rad, turn)
• Time units (s, ms)