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

* supports the following CSS selectors:
o namespace|selector
o parent > child
o adjacent + sibling
o adjacent ~ sibling
o [attr], [attr="value"], [attr~="value"] etc
o .multiple.classes (fixes bug)
o :hover, :active, :focus (for all elements)
o :first-child, :last-child, only-child, nth-child, nth-last-child
o :check, :disabled, :enabled
o :root, :empty, :contains(), :not()
o :before/:after/content:
o :lang()
* works with both HTML and XML documents
* 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)
* standardies forms behavior
* supports PNG alpha transparency
* lightweight script (22K)
* completely modular (add/remove fixes)
* works for Microsoft Internet Explorer 5+ (Windows only)