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HTML

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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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Vendor Prefixing

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML 

              
                <div id="app">
  <bar-chart percent="{{barValue}}" foreground-color="#badaff" background-color="#bada55"></bar-chart><br>
  Value: <input type="range" min="0" step="1" max="100" v-model="barValue"> {{barValue}}<br><br>
  
  <!-- Just define the foreground color, background color, stroke-width and radius -->
  <donut-chart percent="{{value}}" foreground-color="#badaff" background-color="#bada55" stroke-width="{{width}}" radius="{{radius}}"></donut-chart><br>
  
  <!-- Fun tool -->
  Value: <input type="range" min="0" step="1" max="100" v-model="value"> {{value}}<br>
  Radius: <input type="range" min="0" step="1" max="100" v-model="radius"> {{radius}}<br>
  Width: <input type="range" min="0" step="1" max="100" v-model="width"> {{width}}<br>
</div>

<script type="text/x-template" id="bar-template">
  <div class="bar-outer" style="width: 100%; height: {{height}}; background-color: {{backgroundColor}};">
    <div class="bar-inner" style="width: {{percent}}%; height: {{height}};  background-color: {{foregroundColor}}">
  </div>
</script>
  
<script type="text/x-template" id="donut-template">
  <svg width="200" height="200" version="1.1" xmlns="http://www.w3.org/2000/svg" style="border: 1px solid #000000;" viewBox="0 0 200 200">

    <!-- Background circle -->
    <path v-attr="d: dBg"
          fill="transparent"
          stroke="{{backgroundColor}}"
          stroke-width="{{strokeWidth}}"/>
    
    <!-- Move to start position, start drawing arc -->
    <path v-attr="d: d" 
          fill="transparent"
          stroke="{{foregroundColor}}"
          stroke-width="{{strokeWidth}}"/>
  </svg>
</script>
!

CSS 

              
                body {
  background: #ffffff;
}

svg {
  width: 300px;
  height: 300px;
}
!

JS 

              
                Vue.component('bar-chart', {
  props: ['percent', 'foreground-color', 'background-color'],
  template: '#bar-template',
  replace: true,
  data: function () {
    return {
      // default values
      foregroundColor: "#badaff",
      backgroundColor: "#bada55",
      percent: 25,
      height: '1em'
    }
  },
});

Vue.component('donut-chart', {
  props: ['percent', 'foreground-color', 'background-color', 
         'stroke-width', 'radius'],
  template: '#donut-template',
  replace: true,
  data: function () {
    return {
      // default values
      foregroundColor: "#badaff",
      backgroundColor: "#bada55",
      radius: 85,
      strokeWidth: 20,
      percent: 25
    }
  },
  computed: {
    // If more than 50% filled we need to switch arc drawing mode from less than 180 deg to more than 180 deg
    largeArc: function () {
      return this.percent < 50 ? 0 : 1;
    },
    // Where to put x coordinate of center of circle
    x: function () {
      return 100;
    },
    // Where to put y coordinate of center of circle
    y: function () {
      return 100 - this.radius;
    },
    // Calculate X coordinate of end of arc (+ 100 to move it to middle of image)
    // add some rounding error to make arc not disappear at 100%
    endX: function () {
      return -Math.sin(this.radians) * this.radius + 100 - 0.0001;
    },
    // Calculate Y coordinate of end of arc (+ 100 to move it to middle of image)
    endY: function () {
      return Math.cos(this.radians) * this.radius + 100;
    },
    // Calculate length of arc in radians
    radians: function () {
      var degrees = (this.percent/100)*360
      var value = degrees - 180; // Turn the circle 180 degrees counter clockwise
      
      return (value*Math.PI)/180;
    },
    // If we reach full circle we need to complete the circle, this ties into the rounding error in X coordinate above
    z: function () {
      return this.percent == 100 ? 'z' : '';
    },
    dBg: function () {
      return "M "+this.x+" "+this.y+" A "+this.radius+" "+this.radius+" 0 1 1 "+(this.x-0.0001)+" "+this.y+" z";
    },
    d: function () {
      return "M "+this.x+" "+this.y+" A "+this.radius+" "+this.radius+" 0 "+this.largeArc+" 1 "+this.endX+" "+this.endY+" "+this.z;
    }
  }
});

var vm = new Vue({
  el: '#app',
  data: {
    // Bar 
    barValue: 25,
    
    // Donut
    value: 25,
    radius: 85,
    width: 20
  }
});
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999px

Console