How to show a little arrow glyph after 'target="_blank"' anchors

What I wanted was a visual indication of which urls would open in a new window.

I found a pure css solution, that didn't require altering the html at all.

a[target="_blank"]:after {
    content: " \2197";

This means:

any a element with 'target="_blank"' 
should have a small North East arrow after it.

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