Markup Grid is a developer tools chrome extension. it's a free extension , it has 68 active users since released its first version, it earns an average rating of 2.50 from 4 rated user, last update is 3868 days ago.
Extension add simple grid. You can set size, color, opacity for cells and width, alignment and parent selector for container. Extension remember setting for all domains where extension was used, and store it in localStorage. Grid can be toggled with hotkeys, and change position using keyboard arrow.
You could download the latest version crx file or older version files and install it.
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100% user give 3-star rating. Read reviews of markup grid
You could find more help information from markup grid support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of markup grid.
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I needed a grid system to use as an overlay on a flash game. The grid itself is fine but you cant play or move around in the flash game while the grid is active.