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HTML

            
              <article>
    <h1>Disable iOS input zoom (CSS only)</h1>
    <p>It seems like the only way to prevent iOS from zooming in on input fields is to set a font size of minimum 16px... but what if I like 12px better?</p>

    <fieldset>    
        <input type="text" value="zoom"><input type="text" class="no-zoom" value="zoom disabled">
    </fieldset>
    
    <p>To workaround this we set the font size to 16px and use transform scale (12px/16px = 0.75) to size everything
       down to a visual match of 12px addjusting margins to remove empty space caused by the transform.</p>
    <p>Please note that CSS transforms can cause problems with subpixel rendering (blurry borders and lighter colors).</p>
    
    <p>Open page in <a href="https://codepen.io/jakob-e/debug/yakBwJ" target="_blank">debug mode</a>, <a href="https://codepen.io/jakob-e/pen/yakBwJ" target="_blank">code mode</a> or scan the QR below:</p>   
   <img src='https://chart.googleapis.com/chart?cht=qr&chl=http%3A%2F%2Fcodepen.io%2Fjakob-e%2Fdebug%2FyakBwJ&chs=180x180&choe=UTF-8&chld=L|2' alt=''>
</article>
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CSS

            
              @import url('https://fonts.googleapis.com/css?family=Raleway|Roboto+Condensed');
html{box-sizing: border-box;}
*,*:before,*:after {box-sizing:inherit;}
body {margin:16px;  -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: transparent; }
article,fieldset {display:block;}
h1 { font-family: 'Raleway', sans-serif; color:tomato;  }
p  { font-family: 'Roboto Condensed', sans-serif; font-size:14px; }
article { max-width: 480px; margin:0 auto; }
fieldset {border:0;margin:24px 0 24px -12px;padding:0;text-align:center;font-size:0; }
input {margin:0 0 12px 12px; }
img { margin:16px auto; display:block; max-width: 100%;}
a {color: tomato; text-decoration: none;&:hover{text-decoration:underline;}}


input {
    vertical-align: top;
    appearance: none;
    border: 1px solid silver;
    border-radius: 5px;
    padding: 4px;
    width : 180px;
    height: 24px;    
    font-size: 12px; 
    outline: 0;
}
input:focus { border-color: skyblue; }

.no-zoom {
    font-size: 16px;
    transform-origin: top left;
    transform: scale(0.75);    //  12px / 16px

    //  size up
    width:  240px;             // 180px / 0.75
    height: 32px;              //  24px / 0.75
    padding      : 5.333333px; //   4px / 0.75
    border-radius: 6.666667px; //   5px / 0.75
    border-width : 1.333333px; //   1px / 0.75
    
    //  size down    
    margin-right: -60px;       // 240px * 0.25
    margin-bottom: -8px;       //  32px * 0.25
    
    
    
}
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