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Fluid Grids are a powerful HTML5 tool, and can simplify building sites that work across phones, tablets and PCs. You start by using Dreamweaver CS6's grid wizard to choose the number of columns in a grid, as well as the percentage of the page used for columns. Grid elements will align to your columns, and you can choose which ones show at which screen resolution. There's no need to add code — CSS media queries handle browser resolution detection for you.