Scrollbar is not showing in textarea for height:30px

问题

I am helping my friend today. He came across an issue that he wants a textarea to display in a height of 30px with scrollbar. Unfortunately if we give a height to the textarea the scrollbar is not shown but its working when we use the mouse scroller/keyboard up and down navigation keys.

Css

<style type="text/css">
.txtarea { height:50px; overflow-y:scroll;  }
</style>

Html

<textarea class="txtarea"></textarea>

Please help.

回答1:

.txtarea {
    overflow-y: visible
}

Also, The text area has to be at least ~70px high otherwise the box is too small to show the scrollbar.

http://jsfiddle.net/gTzPM/

来源：https://stackoverflow.com/questions/4646373/scrollbar-is-not-showing-in-textarea-for-height30px