js css makes the text box automatically adapt to the height of the content_form special effects

<textarea rows="1" cols="40" style="overflow:scroll;overflow-y:hidden;;overflow-x:hidden" onfocus="window.activeobj=this;this.clock=setInterval(function(){activeobj.style.height=activeobj.scrollHeight 'px';},200);" onblur="clearInterval(this.clock);">
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With input As the content increases, the number of lines will automatically increase.