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Here's a screen shot of how what you're reading looks like for me writing it in the Blogger Compose Interface:
Cross-posted at Internet Baseball Scorecard | "At-Bat Box - span TEST" | http://internetbaseballscorecard2013.blogspot.ca/2014/04/at-bat-box-span-test.html
mh
The sizes of the Span text areas are regulated by font-size elements for height; and five 'periods' for width (the smallest text character there is).
A background color widget would be nice so I could create properly sized boxes under the infield icon.
The Compose interface does not show any part of the canvas drawings - all that shows before any text background color is added - is the outfield-icon-colour-green, that is preloaded into the upper colour notation boxes so that it matches the outfield icon behind it. Also I have the top text areas (northwest & northeast) set to render a dashed line along the bottom of their extent - so I can see where they are in Compose. Like-wise, in order to indicate the top and bottom borders of the At-Bat Box in Compose, I set the Pitching notation box to render a dashed line along it's right border.
It will work but it doesn't look very good on publish - as you can see. I'll keeping working on it - but at least I can score ball games now.
Blogger is not HTML5 ready - which is a little disappointing, considering they just spent 2 years rebuilding it.