Polyfills can be used to build in missing features with JavaScript, but acceptable alternatives to features like styling and layout should be provided where possible, for example by using the CSS cascade, or HTML fallback behavior. Some good examples can be found in Handling common HTML and CSS problems .

It is a useful technique that allows Web developers to focus on developing the best possible websites, given that those websites are accessed by multiple unknown user-agents. Progressive enhancement is related but different — often seen as going in the opposite direction to graceful degradation. In reality both approaches are valid and can often complement one another.