title: Auto format iframe width & height
body: <p>I have a text field which I would like customers fill their YouTube video with. The YouTube video share coding is an <code>iframe</code> and normally it takes value like <code>width=560</code>, <code>height=315</code>.</p>
  
  <p>Now, if the customer pasted the <code>iframe</code> code into my text field, then the <code>560 width</code> will be a problem as this width is too much for responsive design, when stretch down to mobile size, the <code>iframe</code> problem will show.</p>
  
  <p>I now need <strong>jQuery</strong> code which, when the customer fills in the <code>iframe</code>, will automatically format the width and height down to <code>width=230</code>, <code>height=160</code>.</p>