brタグを使わず特殊文字( )を使うと改行できる
= text_area :hoge, :huga, placeholder: '1行目 2行目 3行目'.html_safe
※OSによって適用されない場合もあるようです。
| Chrome | Firefox | Safari | IE | |
|---|---|---|---|---|
| Mac | ◯ | × | × | - |
| Windows | ◯ | ◯ | - | ◯ |
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