Re: [csswg-drafts] [css-grid] Decorative grid-cell pseudo-elements

**Use case**:
a designer / developer / designoper is able to create a grid overlay 
made using the grid spec, this overlay can then be viewed in the 
browser as a device for laying-out content. Otherwise grid alignment, 
and understanding the possible variations using a grid, is essentially
 'by eye'. Other than being able to imagine the structure of a grid 
layout, or refer to a piece of paper with a grid drawn out on it 
whilst working, there inevitably needs to be a way to display a grid 
of this kind if said user is solely working with the browser.

There are reference books which teach the use of grid layout, I 
haven't seen a single book that doesn't show a grid overlay as part of
 the process. Screen shots from a PDF on the book _Grid Systems in 
Graphic Design_ written by: Josef Müller-Brockmann to demonstrate.
![image](https://cloud.githubusercontent.com/assets/1900222/23025476/0ba02cfe-f456-11e6-94d7-15e66f2efc93.png)
![image](https://cloud.githubusercontent.com/assets/1900222/23025326/7a94f1b8-f455-11e6-9893-a2aeb83b18db.png)


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Received on Thursday, 16 February 2017 14:59:48 UTC