Sidebars have been on websites long before Google introduced its first iteration of Material Design back in 2014. Since then, a lot of things have changed, but the company's condensed version of the sidebar has stuck with many websites over the years, most prominently Google Photos. It has also found its way into many other Google web services, like Google Play Music, YouTube, Hangouts, and even Gmail. Now Google has finally added this condensed sidebar to its Material Design guidelines and gave it a proper name: navigation rail. The specification is still under development, and it might even come to Android apps using tablet layouts in the future.

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