<button class="btn btn-primary clipboard" data-mdb-clipboard-target="#copy-target">

  Copy

</button>

​

<br><br>

​

Source<br>

<textarea id="copy-target" rows="5" cols="20">

first line

second line

third line

</textarea>

​

<br><br>

Try paste here, no newline in clipboard<br>

<textarea rows="5" cols="40">

</textarea>