兼容技巧 IE7

IE7 provides Microsoft Internet Explorer with support for W3C standard CSS and HTML:

• supports the following CSS selectors:
  • parent > child
  • adjacent + sibling
  • adjacent ~ sibling
  • [attr], [attr="value"], [attr~="value"] etc
  • .multiple.classes (fixes bug)
  • :hover, :active, :focus (for all elements)
  • :first-child, :last-child, only-child, nth-child, nth-last-child
  • :check, :disabled, :enabled
  • :empty, :contains(), :not()
  • :before/:after/content:
  • :lang()
• supports imported style sheets
• preserves the cascade of the style sheet
• does not alter the document structure
• does not repeatedly query the DOM tree using JavaScript
• uses pure CSS to enforce style sheet rules
• supports the W3C box model in both standards and quirks mode
• supports fixed positioning (flicker free)
• supports overflow:visible
• supports min/max-width/height
• fixes broken (X)HTML elements (abbr, object)
• standardised forms behavior
• supports PNG alpha transparency
• lightweight script (11KB)
• works for Microsoft Internet Explorer 5+ (Windows only)