Vertical tabs will change the way you browse the web. ... To do that, you’ll tap into an especially geeky Firefox feature that lets you customize the menu system using CSS code.

Meet XP.css — a gorgeous new CSS library that makes ... including buttons, windows, checkboxes, sliders, tabs, and dropdown ... Just like 98.css, XP.css relies on semantic HTML and doesn’t ...

Output: The results of executing the CSS, HTML, and JavaScript entered into the sections of the page. Figure A shows jsFiddle loaded in Internet Explorer 9 with empty code panes.