Guides are created by click-and-dragging corresponding horizontal or vertical ruler. Guide positions could be saved in a local storage and opened later (on a page location basis) It is possible to open/save created guides as grids (Note: grids will be saved on a page location basis, so it's not possible to use the same grids in another browser window/tab). Rulers can be unlocked, so that one of the rulers will scroll along the page and the other will be always visible. Guides can be snapped to defined number of pixels. Detailed info mode is available, which shows position and size of regions created by the guides. Guides can be snapped to DOM elements (experimental)