css3-mixins-tricks

Tips & Tricks, A bunch of tips and tricks I've learned and found very helpful.

Css3 Best Practice

It's important when building a web page to avoid unecessary element, to remind this there is some tricky way using css3. In the sample below we will display a counter within a badge.

Note: The content property is used with the :before and :after pseudo-elements, to insert generated content. The attr() CSS function is used to retrieve the value of an attribute of the selected element and use it in the style sheet. It can be used on pseudo-elements too and, in this case, the value of the attribute on the pseudo-element's originated element is returned.The attr() function can be used with any CSS property.

See sample below:

#bad practice

Example:

HTML:

<a href="#">Inbox <span class="badge">42</span></a>

<button class="btn btn-primary" type="button">
  Messages <span class="badge">4</span>
</button>

CSS:

#good practice

HTML:

<a href="#" data-count="4">Inbox <span class="badge">42</span></a>

<button data-count="4" class="btn btn-primary" type="button"></button>

CSS:

  .btn:after { 
    position: absolute; 
    z-index: 1; 
    top: 2px; 
    right: 5px; 
    content: attr(data-count); 
    display: block; 
    width: 13px; 
    height: 13px; 
    border: 1px solid #FFF; 
    border-radius: 13px; 
    background-color: #C30019; 
    font-weight: bold; 
    white-space: normal; 
    color: #FFF; 
    text-align: center; 
    font-size: 9px; 
  }