html - Text box that gets longer as you type -

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<div class="container">    <form action="/html/tags/html_form_tag_action.cfm" method="post">      <div>        <input type="text" id="text" name="text_name" class="mytext" placeholder="comments" style="height:100px"/>      </div>    </form>  </div>

i want create text box has set size type in text box, box can longer not wider ie on facebook or twitter post, type instead of text getting hidden on left hand side whole box becomes longer

i have attached code have

(also side note, how can comment placeholder move top of text box)

thanks in advance

this how it:

.mytext {    word-break: break-word; }

here jsfiddle demo


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