【html5shiv.js】

HTML5Shiv is a JavaScript workaround, invented by Sjoerd Visscher, to enable styling of HTML5 elements in versions of Internet Explorer prior to version 9, which do not allow unknown elements to be styled without JavaScript.

<header> <footer> <nav> <article> <section>


【respond.js】

Response is an experimental jQuery plugin for building websites with responsive content. It can dynamically swap content based on breakpoints and data attributes.

CSS3 Media Queries