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Anatomy of an extension


Move HTML5 example above the HTML4 example. Add explicit note that the HTML4 version is invalid in HTML5 (as a lot of people are still using it in HTML5 IMHO)

A re-introduction to JavaScript (JS tutorial)

The end parameter for Array.slice is optional.

A re-introduction to JavaScript (JS tutorial)

The array.unshift() methods takes multiple parameters. However, a.unshift([item]) suggests calling this method with an array of items e.g. [1, 2, 3]. The correct signature should be a.unshift(item1, …, itemN) (which is same as a.push())