Trigger CSS3 transition on page load

Question

I am trying to achieve a loading effect on the page load by CSS3 width transition. Here is the demo.

HTML

<div class="skill-bar">
    <span class="w70"></span>
</div>

CSS

.skill-bar {
    width: 57%;
    float: left;
    height: 11px;
    border-radius: 5px;
    position: relative;
    margin: 6px 0 12px 0;
    border: 2px solid #00edc2;
}
.skill-bar span {
    background: #00edc2;
    height: 7px;
    border-radius: 5px;
    display: inline-block;
}
.skill-bar span.w70 {
    width: 70%;
}
.skill-bar span {
    width: 0;
    transition: width 1s ease;
    -webkit-transition: width 1s ease;
    background-color: #00edc2;
}

Its not working as expected. I need the transition to happen when the page is loaded.

But when I inspect element and check/uncheck the width of the span, I get the effect.

How to have the same effect on page load?

Answer 1

You can achieve the effect without JavaScript and without any compatibility issue using CSS animation:

<div class="skill-bar">
    <span class="w70"></span>
</div>

---

.skill-bar {
    width: 57%;
    float: left;
    height: 11px;
    border-radius: 5px;
    position: relative;
    margin: 6px 0 12px 0;
    border: 2px solid #00edc2;
}
.skill-bar span {
    background: #00edc2;
    height: 7px;
    border-radius: 5px;
    display: inline-block;
}
.skill-bar span {
    animation: w70 1s ease forwards;
}
.skill-bar .w70 {
    width: 70%;
}
@keyframes w70 {
    from { width: 0%; }
    to { width: 70%; }
}

Fiddle for webkit: http://jsfiddle.net/ySj7t/