finermac: When using Safari in Lion’s Full-Screen mode, you can grab the edges of the browser and drag inward to reduce the width, making fluid websites easier to read on wide monitors, while keeping a nice clutter free view.
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finermac:

When using Safari in Lion’s Full-Screen mode, you can grab the edges of the browser and drag inward to reduce the width, making fluid websites easier to read on wide monitors, while keeping a nice clutter free view.

Source: finermac