Broadly speaking, there are three methods for bringing Internet Explorer 6 – 8 up to speed with modern web standards:

Replace the rendering engine in IE with something better, such as ChromeFrame, that understands both CSS3 and HTML5. (It can be difficult to convince clients and visitors to a site to do this, however).

If your page is written in HTML, try to work in IE-equivalents to CSS by using -ms- vendor prefix selectors for IE9, and / or work in older Microsoft proprietary equivalents to transforms and gradients, into the CSS.

"Shim" the web page with JavaScript that will allow IE6 – 8 to understand CSS2 & 3 selectors, properties and values.

If you choose to take the second option, I would suggest using a transform translator to generate CSS for IE 6 – 8, and using ColorZilla to do the same process for gradients.

If you take the last option, there are a number of possible solutions. Previously, I've discussed using JavaScript to make IE aware of HTML5. Some of those scripts can also make IE CSS3-aware; what follows are exclusively CSS3 solutions for IE written in JavaScript.

• CSS3Pie enables IE support of border-radius, box-shadow, border-image, multiple background images, and linear gradients. Uses the values of CSS written for other browsers (such as Mozilla and Webkit) to generate values for IE.
• cssSandpaper is a framework to support CSS3 2D Transformations in IE: rotate, skew and scale, along with linear gradients and box-shadow. Uses a shortcut system with its own prefix (-sand) to generate appropriate CSS for all browsers.
• eCCStender supports CSS3 selectors, @font-face, CSS3 backgrounds, borders and colors, transitions and transforms in IE 6 – 8, via a series of extensions.
• Selectivizr is a tool that allows IE 6 - 9 to understand and use CSS3 selectors such as :first-child and ::first-letter.

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