Google on Monday talked about a subtle yet important design change that allows for faster navigation in the Gmail web interface. The company wanted to solve a problem where scrolling the message list in your browser also scrolled the lefthand navigation pane, making it cumbersome to effectively comb through a large message list and at the same time access labels, the chat interface and other gadgets placed in the leftmost column.

They played with two possible solutions (see the above image) calling for both the floating label sections that expands when you are mousing over the Inbox label and the fixed design before settling on a solution combining the two (below). As explained in a blog post:

The final design combines aspects of both approaches. It is a ducking accordion design with only two sections. The bottom section has two tabs, one for chat and one for gadgets, with room to add more tabs in the future. The upper section, which contains labels, expands to show all of the visible labels when you mouse over it. This allows you to see chat contacts but still give quick access to the labels. Best of all, you can easily adjust the balance between labels and chat to fit your own personal preference by dragging the divider between the sections up and down.

They also agonized over the timing and triggering behavior of the expanding labels section in order to minimize accidental triggering. The sections expand only upon moving your mouse below the Inbox label and keeping it there for a moment.

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