html5shiv is a JavaScript compatibility polyfill and legacy browser shim that enables the use of HTML5 sectioning elements in outdated versions of Internet Explorer. It provides a compatibility layer that ensures modern HTML5 tags are recognized and rendered correctly by overriding element creation methods.
The library ensures that HTML5 sectioning elements contain their child elements in old web engines by applying basic styles. It specifically addresses layout and styling discrepancies for both screen and print media to prevent layout collapse.
The project includes a programmable configuration system that allows the internal registry to be extended with custom HTML5 elements.
