[Bootstrap 3] icon font を input box 内に表示する

memo.

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> [css – Add Bootstrap Glyphicon to Input Box – Stack Overflow](http://stackoverflow.com/questions/18838964/add-bootstrap-glyphicon-to-input-box)

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See the Pen Add Bootstrap Glyphicon to Input Box by DriftwoodJP (@DriftwoodJP) on CodePen.