Adding a space to a phone number with just CSS

Question

I have a page which generates a phone number in HTML, like this:

01987123456

What I want is to simply pu

Answer 1

I was interested to see if this could be done with CSS, even if it shouldn't be done! The following is quite hacky, ideally the phone number would be formatted server side or, if that isn't an option, with JavaScript.

A few caveats:

• This requires an attribute to be added to .phone for the pseudo element to use. This may or may not be a deal breaker given that you seem to have limited access to the HTML
• If the phone number is not in a suitable format (e.g. something like 01 987123456) it will not display correctly
• A nasty little hack is used for IE as it doesn't calculate the width of the pseudo element correctly using ch for some reason. Credit to SW4 for this: https://stackoverflow.com/a/20541859
• A solid background colour is required

The general idea behind this is as follows:

• .phone
  • text-indent: 1ch; on .phone moves the whole text to the left by one character
  • .phone is set to position: relative; to allow the pseudo element to be positioned relatively to it
  • white-space: nowrap; ensures that this doesn't wrap onto a new line if there is a break in the number
• .phone:before
  • background-color: white; masks the digits in .phone
  • border-right: 1ch solid white; hides the sixth digit in .phone, in effect this is the space
  • content: attr(data-phone); uses the data-phone attribute on .phone to populate the pseudo element with the same number
• left: 0;, position: absolute; and top: 0; are used to position the pseudo element
• overflow: hidden; hides any characters over the 5 character limit
• text-indent: 0; resets text-indent: 1ch; set on .phone
• width: 5ch; ensures that the pseudo element is only 5 characters long
• The weird media query is the hack to target IE

Tested and working in FF 38.0.5, Chrome 43.0.2357.124 m and IE 11. Browsers not supporting the ch unit (such as Opera 12.17 and Windows Safari 5.1.7) seem to show the phone number in its natural state.

.phone {
    position: relative;
    text-indent: 1ch;
    white-space: nowrap;
}
.phone:before {
    background-color: white;
    border-right: 1ch solid white;
    content: attr(data-phone);
    display: block;
    left: 0;
    overflow: hidden;
    position: absolute;
    text-indent: 0;
    top: 0;
    width: 5ch;
}
@media screen and (min-width:0\0) and (min-resolution: +72dpi) {
    .phone:before {
        width: 5.8ch;
    }
}

<div class="phone" data-phone="01987123456">01987123456</div>

JS Fiddle: https://jsfiddle.net/scarjnb1/

Answer 2

It's not possible using CSS, just JavaScript. Then it'd be:

<div id="phone">01987123456</div>

<script>
    var el = document.getElementById('phone');
    phone.innerText = phone.innerText.replace(/^(\d{5})/, '($1) ');
</script>