The HTML <table> tag has had a somewhat infamous existence in the world of web design. It was originally intended to present scientific data in a spreadsheet-like manner. But as the web grew, graphic designers got into the web design game. They wanted to recreate the types of layouts seen in magazines, books, and newspapers (in other words, they wanted to make good-looking websites). The most reliable tool at the time was the <table> tag, which designers morphed into a way to create columns, sidebars, and, in general, to precisely position elements on a page.

The wheel has turned again. Today, with nearly everyone on the planet using advanced browsers like Internet Explorer, Firefox, Safari, and Opera, web designers use a more facile page-styling technique—CSS-based layout. Table-based layout is an aging dinosaur that produces pages heavy with code (which means they download slower), are hard to update, and are hostile to alternative browsers, such as screen readers, mobile phones, and text-only browsers.