如何使低版本浏览器支持HTML5？

CSS

/* Make HTML 5 elements display block-level for consistent styling */
header, nav, article, footer, address { 
    display: block; 
}

然而IE6忽略了它，因为它不认识它们

The JavaScript

document.createElement("article");
document.createElement("footer");
document.createElement("header");
document.createElement("hgroup");
document.createElement("nav");