successor to https://github.com/twbs/bootstrap/pull/20260
closes https://github.com/twbs/bootstrap/issues/20234
for comparison: current v4-dev (top) using the unicode character, and the CSS SVG background image (bottom)
successor to https://github.com/twbs/bootstrap/pull/20260
closes https://github.com/twbs/bootstrap/issues/20234
for comparison: current v4-dev (top) using the unicode character, and the CSS SVG background image (bottom)