As the sticky navigations are quicker to navigate and are always available no matter what part of the page is being shown to the user, developers have adopted this approach in a lot of websites.
This is a simple posticks app using HTML5, CSS3 and jQuery
The following browsers support this feature: Opera 9.5+, Chrome, Firefox 3.5+, and Safari 1.1+. Historically, this feature was only supported by Safari, but now all recent major browsers support this property except IE.
Remember that 90% of the time people are looking for information when they enter a website, and they are looking for that information immediately.