Why does mobile Safari cut off the text in an input form?

问题

Why does an input form on mobile Safari have more padding inside it and push the text to the right so it gets cut off?

I set the width of the input field at 20px which is plenty for the desktop web but on mobile it needs >26px.

^ Desktop Safari Web Input Form ^

^ Mobile iOS Safari Input Form ^

CSS

.phone-input {
    width: 20px;
    text-align: center;
    font-size: 16px !important;
    height: 1.75em;
    //border: 0;
    outline: 0;
    background: transparent;
}

HTML

'<div class="phone-field">'+
     '(<input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-" autofocus="autofocus"><input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-"><input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-">)   '+
     '<input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-"><input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-"><input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-"> - '+
     '<input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-"><input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-"><input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-"><input class="phone-input" name="phone-input" type="tel" size="1" maxlength="1" placeholder="-">'+
'<\/div>'

回答1:

It took me hours to figure out, but the solution is simple:

Just use padding: 0;

(Mobile safari adds a default padding to input fields)

来源：https://stackoverflow.com/questions/31860787/why-does-mobile-safari-cut-off-the-text-in-an-input-form