What is HTML5 ARIA? - Stack Overflow

What is HTML5 ARIA? - Stack Overflow: "ARIA stands for Accessible Rich Internet Applications"

CSS: box-sizing

Don't Overthink It Grids | CSS-Tricks: "Gutters
The hardest part about grids is gutters. So far we've made our grid flexible by using percentages for widths. We could make the math all complicated and use percentages for gutters as well, but personally I don't like percentage gutters anyway, I like fixed pixel size gutters. Plus, we're trying to keep too much thinking out of this.

The first step toward this is using box-sizing: border-box;. I like using it on absolutely everything.

*, *:after, *:before {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
Now when we set a width, that element stays that width, despite padding or borders being applied."

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