CSS3 simple donut chart

Question

What I'm trying to do is create a simple donut chart. I'm currently using CSS(3) only but I don't know if it's possible without javascript.

What I have so far: http://jsfiddle.net/aBP5Q/

HTML:

<div class="donut-container" style="background: #9C0;">
    <div class="donut-inner">
        <div class="donut-label">HTML</div>
    </div>
</div>

CSS:

.donut-container {
    width: 150px;
    height: 150px;
    float: left;
    -webkit-border-radius: 75px;
    -moz-border-radius: 75px;
    border-radius: 75px;
    margin-right: 20px;
}

.donut-inner {
    width: 134px;
    height: 134px;
    position: relative;
    top: 8px;
    left: 8px;
    background: #FFF;
    -webkit-border-radius: 65px;
    -moz-border-radius: 65px;
    border-radius: 65px;
}

.donut-label {
    line-height: 130px;
    text-align: center;
    font-size: 20px;
}

I would like to display the green and blue colors as the precentage. So no green is 0% and full green (360 degrees) is 100%. Maybe even with a simple animation when the chart is loaded if its possible.

Your help is much appreciated.

Answer 1

SVG for the win!

.item {
    position: relative;
    float: left;
}

.item h2 {
    text-align:center;
    position: absolute;
    line-height: 125px;
    width: 100%;
}

svg {
   -webkit-transform: rotate(-90deg);
    transform: rotate(-90deg);
}

.circle_animation {
  stroke-dasharray: 440; /* this value is the pixel circumference of the circle */
  stroke-dashoffset: 440;
}

.html .circle_animation {
    -webkit-animation: html 1s ease-out forwards;
    animation: html 1s ease-out forwards;
}

.css .circle_animation {
    -webkit-animation: css 1s ease-out forwards;
    animation: css 1s ease-out forwards;
}

@-webkit-keyframes html {
  to {
    stroke-dashoffset: 80; /* 50% would be 220 (half the initial value specified above) */
  }
}

@keyframes html {
  to {
    stroke-dashoffset: 80;
  }
}

@-webkit-keyframes css {
  to {
    stroke-dashoffset: 160;
  }
}

@keyframes css {
  to {
    stroke-dashoffset: 160;
  }
}

<div class="item html">
    <h2>HTML</h2>
    <svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
     <g>
      <title>Layer 1</title>
      <circle class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#6fdb6f" fill="none"/>
     </g>
    </svg>
</div>

<div class="item css">
    <h2>CSS</h2>
    <svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
     <g>
      <title>Layer 1</title>
      <circle class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#69aff4" fill="none"/>
     </g>
    </svg>
</div>

JSFiddle version

---

Here is a version with background circles as requested in the comments:

.item {
    position: relative;
    float: left;
}

.item h2 {
    text-align:center;
    position: absolute;
    line-height: 125px;
    width: 100%;
}

svg {
   -webkit-transform: rotate(-90deg);
    transform: rotate(-90deg);
}

.circle_animation {
  stroke-dasharray: 440; /* this value is the pixel circumference of the circle */
  stroke-dashoffset: 440;
}

.html .circle_animation {
    -webkit-animation: html 1s ease-out forwards;
    animation: html 1s ease-out forwards;
}

.css .circle_animation {
    -webkit-animation: css 1s ease-out forwards;
    animation: css 1s ease-out forwards;
}

@-webkit-keyframes html {
  to {
    stroke-dashoffset: 80; /* 50% would be 220 (half the initial value specified above) */
  }
}

@keyframes html {
  to {
    stroke-dashoffset: 80;
  }
}

@-webkit-keyframes css {
  to {
    stroke-dashoffset: 160;
  }
}

@keyframes css {
  to {
    stroke-dashoffset: 160;
  }
}

<div class="item html">
    <h2>HTML</h2>
    <svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
     <g>
      <title>Layer 1</title>
      <circle r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#f2f2f2" fill="none"/>
      <circle class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#6fdb6f" fill="none"/>
     </g>
    </svg>
</div>

<div class="item css">
    <h2>CSS</h2>
    <svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
     <g>
      <title>Layer 1</title>
      <circle r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#f2f2f2" fill="none"/>
      <circle class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#69aff4" fill="none"/>
     </g>
    </svg>
</div>

---

How does it work?

stroke-dasharray is used to define the 'pattern' a dashed line uses (MDN). By providing a single value you create a pattern with a dash of 440px and a space of 440px. (440px is roughly the circumference of the circle).

stroke-dashoffset effectively moves the starting point of the dash pattern (MDN).

A dash-offset of 220 (half of the stroke-dasharray) would produce a half-circle. 110 = quarter circle etc.