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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

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About Vendor Prefixing

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HTML 

              
                <header>
  <h1>Pure <strong>CSS</strong> Loader</h1>
  <p>... a Sassy SVG snippet.</p>
</header>
<section>
  <header aria-hidden="true">
    <h2>Enjoy this <strong>tasty snippet,</strong> it works without any JavaScript code and is "ready-to-use".</h2>
  </header>
  <div class="header">
    <div class="chart-container">
      <?xml version="1.0" encoding="utf-8"?>
      <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
      <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="12.5em" height="12.5em" viewBox="0 0 200 200" enable-background="new 0 0 200 200" xml:space="preserve" class="svg-loader">
                        <defs>
                            <filter id="glow" x="-120%" y="-120%" width="400%" height="400%">
                                <feOffset result="offOut" in="SourceGraphic" dx="0" dy="0"></feOffset>
                                <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10"></feGaussianBlur>
                                <feBlend in="SourceGraphic" in2="blurOut" mode="overlay"></feBlend>
                            </filter>
                        </defs>
                        <g transform = "rotate(-89 100 100)">
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="svg-loader_glow white" filter="url(#glow)"/>
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="svg-loader_grow svg-loader_animate red hair-line" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"/>
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="svg-loader_grow svg-loader_animate lime" role="progressbar" aria-valuenow="95" aria-valuemin="0" aria-valuemax="100" transform = "scale(.8, .8) translate(25 25)"/>
                        </g>
                    </svg>
    </div>
  </div>
  <article>
    <input type="checkbox" name="valuenow-90" id="valuenow-90" class="valuenow-90" value="">
    <div class="info">
      <div>
        <header>
          <h3>It's Easy.</h3>
        </header>
        <p>This loader is really easy to use, just change the <code>aria-valuenow</code> attribute to see it in action.</p>
      </div>
      <label for="valuenow-90">Change valuenow</label>
    </div>
    <div class="chart-container">
      <?xml version="1.0" encoding="utf-8"?>
      <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
      <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="12.5em" height="12.5em" viewBox="0 0 200 200" enable-background="new 0 0 200 200" xml:space="preserve" class="svg-loader">
                        <defs>
                            <filter id="glow" x="-120%" y="-120%" width="400%" height="400%">
                                <feOffset result="offOut" in="SourceGraphic" dx="0" dy="0"></feOffset>
                                <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10"></feGaussianBlur>
                                <feBlend in="SourceGraphic" in2="blurOut" mode="overlay"></feBlend>
                            </filter>
                        </defs>
                        <g transform = "rotate(-89 100 100)">
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="gray" />
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="svg-loader_grow cyan hair-line" role="progressbar" aria-valuenow="66" aria-valuemin="0" aria-valuemax="100"/>
                        </g>
                    </svg>
    </div>
  </article>
  <article>
    <input type="checkbox" name="valuenow-33" id="valuenow-33" class="valuenow-33" value="">
    <div class="info">
      <div>
        <header>
          <h3>Customize it.</h3>
        </header>
        <p>It's pretty easy to customize.</p>
        <p>You can use svg filters too, but take care about the performance.</p>
      </div>
      <label for="valuenow-33">Change valuenow</label>
    </div>
    <div class="chart-container">
      <?xml version="1.0" encoding="utf-8"?>
      <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
      <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="12.5em" height="12.5em" viewBox="0 0 200 200" enable-background="new 0 0 200 200" xml:space="preserve" class="svg-loader">
                        <defs>
                            <filter id="glow" x="-120%" y="-120%" width="400%" height="400%">
                                <feOffset result="offOut" in="SourceGraphic" dx="0" dy="0"></feOffset>
                                <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10"></feGaussianBlur>
                                <feBlend in="SourceGraphic" in2="blurOut" mode="overlay"></feBlend>
                            </filter>
                        </defs>
                        <g>
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" filter="url(#glow)" class="svg-loader_grow lime" role="progressbar" aria-valuenow="85" aria-valuemin="0" aria-valuemax="100" transform = "rotate(-89 100 100)"/>
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="svg-loader_grow white" role="progressbar" aria-valuenow="95" aria-valuemin="0" aria-valuemax="100" transform = "rotate(-89 100 100) scale(.8, .8) translate(25 25)"/>

                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" filter="url(#glow)" class="white hair-line" transform = "scale(.8, .8) translate(25 25)"/>
                        </g>
                    </svg>
    </div>
  </article>
  <article>
    <input type="checkbox" name="valuenow-90" id="valuenow-90-0" class="valuenow-90" value="">
    <div class="info">
      <div>
        <header>
          <h3>Use Heat Bars.</h3>
        </header>
        <p>Build patterns to get a heat-bar with gradient-color steps.</p>
      </div>
      <label for="valuenow-90-0">Change valuenow</label>
    </div>
    <div class="chart-container">
      <?xml version="1.0" encoding="utf-8"?>
      <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
      <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="12.5em" height="12.5em" viewBox="0 0 200 200" enable-background="new 0 0 200 200" xml:space="preserve" class="svg-loader">
                        <defs>
                            <linearGradient id="deg-0" gradientUnits="userSpaceOnUse" x1="50%" y1="0" x2="100%" y2="50%">
                        <stop offset="0" stop-color="#b2ff41" />
                        <stop offset="1" stop-color="#c5ce57" />
                    </linearGradient>
                    <linearGradient id="deg-1" gradientUnits="userSpaceOnUse" x1="100%" y1="50%" x2="50%" y2="100%">
                        <stop offset="0" stop-color="#c5ce57" />
                        <stop offset="1" stop-color="#d99d6d" />
                    </linearGradient>
                    <linearGradient id="deg-2" gradientUnits="userSpaceOnUse" x1="50%" y1="100%" x2="0" y2="50%">
                        <stop offset="0" stop-color="#d99d6d" />
                        <stop offset="1" stop-color="#ec6c83" />
                    </linearGradient>
                    <linearGradient id="deg-3" gradientUnits="userSpaceOnUse" x1="0" y1="50%" x2="50%" y2="0">
                        <stop offset="0" stop-color="#ec6c83" />
                        <stop offset="1" stop-color="#FF3B99" />
                    </linearGradient>
                    <filter id="blur" x="0" y="0" width="200%" height="200%">
                        <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
                        <feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
                    </filter>
                    <pattern id="heatCone" x="0" y="0" width="100%" height="100%" patternContentUnits="userSpaceOnUse" patternUnits="userSpaceOnUse">
                        <g transform = "rotate(89 100 100)">
                        <rect width='50%' height='50%' fill='url(#deg-0)' x="50%" />
                        <rect width='50%' height='50%' fill='url(#deg-1)' x="50%" y="50%" />
                        <rect width='50%' height='50%' fill='url(#deg-2)' y="50%" />
                        <rect width='50%' height='50%' fill='url(#deg-3)' />
                      </g>
                    </pattern>
                            <filter id="glow" x="-120%" y="-120%" width="400%" height="400%">
                                <feOffset result="offOut" in="SourceGraphic" dx="0" dy="0"></feOffset>
                                <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10"></feGaussianBlur>
                                <feBlend in="SourceGraphic" in2="blurOut" mode="overlay"></feBlend>
                            </filter>
                        </defs>
                        <g transform = "rotate(-89 100 100)">
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="gray" />
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="svg-loader_grow thin" stroke="url(#heatCone)" stroke-width="2" role="progressbar" aria-valuenow="33" aria-valuemin="0" aria-valuemax="100"/>
                        </g>
                    </svg>
    </div>
  </article>
  <article>
    <div class="info">
      <div>
        <header>
          <h3>Play with Colors.</h3>
        </header>
        <p>Just adding some colors we can code a temperature-color-behavior.</p>
      </div>
    </div>
    <div class="chart-container">
      <?xml version="1.0" encoding="utf-8"?>
      <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
      <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="12.5em" height="12.5em" viewBox="0 0 200 200" enable-background="new 0 0 200 200" xml:space="preserve" class="svg-loader">
                        <defs>
                            <filter id="glow" x="-120%" y="-120%" width="400%" height="400%">
                                <feOffset result="offOut" in="SourceGraphic" dx="0" dy="0"></feOffset>
                                <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10"></feGaussianBlur>
                                <feBlend in="SourceGraphic" in2="blurOut" mode="overlay"></feBlend>
                            </filter>
                        </defs>
                        <g>

                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class=" gray" transform = "scale(.8, .8) translate(25 25)"/>
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="svg-loader_grow svg-loader_animate-color white" role="progressbar" aria-valuenow="95" aria-valuemin="0" aria-valuemax="100" transform = "rotate(-89 100 100) scale(.8, .8) translate(25 25)" filter="url(#glow)"/>
                            <circle fill="none" cx="6.25em" cy="6.25em" r="5em" class="svg-loader_grow svg-loader_animate-color reflect-x white" role="progressbar" aria-valuenow="85" aria-valuemin="0" aria-valuemax="100" transform = "rotate(-89 100 100) translate(0 200) scale(1, -1)" filter="url(#glow)"/>
                        </g>
                    </svg>
    </div>
  </article>
</section>
<footer>
  <header>
    <?xml version="1.0" encoding="utf-8"?>
    <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
    <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="222px" height="112px" viewBox="0 0 222 112" enable-background="new 0 0 222 112" xml:space="preserve" class="logo">
                <path d="M163.464,55.536h-47.537C115.927,29.283,137.21,8,163.464,8 C189.717,8,211,29.283,211,55.536c0,26.254-21.283,47.537-47.536,47.537c-18.973,0-35.349-11.114-42.973-27.188l-18.787-40.283 C94.166,19.306,77.671,8,58.536,8C32.283,8,11,29.283,11,55.536c0,26.254,21.283,47.537,47.536,47.537 c26.254,0,47.537-21.283,47.537-47.537H58.536"/>
                </svg>
  </header>
</footer>
!

CSS 

              
                @import 'compass/css3';
@import 'compass/reset';
@import url(https://fonts.googleapis.com/css?family=Open+Sans:700,300);
$base-font: 'Open Sans', sans-serif;
$height: 26em;
$duration: .6s;

$blue: #57caf4;
$lime: #b2ff41;
$orange: #ff9d00;
$yellow: #f1c40f;
$green: #76c900;
$navy: #0a4069;
$cyan: #4CF2D8;
$white: #fefefe;
$gray: #444;
$dark: darken($gray, 10);
$red: #FF3B99;

$textColor: $gray;

$bezier: cubic-bezier(0.46,-0.42, 0.56, 1.37);

@function goldenCalc($amount) {
    @return ($amount * 1.618) - $amount;
}

body
{
    font-family: $base-font;
    font-size: 16px;

    text-align: center;

    color: $textColor;
    background: darken($white, 05);
    background-image: linear-gradient(-45deg, $gray, $white);
    // background-image: linear-gradient(-45deg, rgba($orange, 1), rgba($red, 1));
    background-size: 100% 200%;
    background-position: center center;
}

header
{
    margin-bottom: 2em;
}

h1
{
    font-size: 2em;
    margin: 2em 0 1em;
}

h2
{
    margin: 0 auto;
    width: 16em;
    line-height: 1.4em;
}

strong
{
    font-weight: 700;
}
p
{
    line-height: 1.5em;
    margin-bottom: 1em;
    &:last-child
    {
        margin: 0;
    }
}
div
{
    position: relative;
}

[aria-hidden="true"]
{
    position: absolute;
    height: 0;
    text-indent: -900em;
}

$colorsList: (
    lime: $lime,
    red: $red,
    orange: $orange,
    yellow: $yellow,
    blue: $blue,
    cyan: $cyan,
    green: $green,
    gray: $gray,
    dark: $dark,
    white: $white
);

@each $name, $value in $colorsList
{
    .#{$name}
    {
        color: $value;
    }
}

[type="checkbox"]
{
    display: none;
    &:checked.valuenow-90 ~ .chart-container .svg-loader [aria-valuenow]
    {
            stroke-dashoffset: 50;
    }
    &:checked.valuenow-66 ~ .chart-container .svg-loader [aria-valuenow]
    {
            stroke-dashoffset: 170;
    }
    &:checked.valuenow-33 ~ .chart-container .svg-loader [aria-valuenow]
    {
            stroke-dashoffset: 335;
    }
    &:checked[class^="valuenow-"] ~ .info label
    {
        opacity: .4;
    }
}

.header
{
    padding-top: 4em;
    .svg-loader
    {
        transform: scale(1.4);
    }
}

article
{
    display: flex;
    flex-direction: row-reverse;
    width: 40em;
    height: goldenCalc(40em);
    box-sizing: border-box;
    margin: 4em auto;
    padding: 3em;
    background-size: 200% 100%;
    background-position: 70% top;
    border-radius: .4em;
    // box-shadow  :
    //             0 1.7em 5.5em -.94em rgba($dark, 0.3),
    //             0 2em 3em .5em rgba($dark, 0.1),
    //             0 1.8em 2em -1.5em rgba($dark, 0.2);
    .info
    {
        text-align: left;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        color: $white;
        perspective: 900px;
        flex: 0 1 14em;
        padding-left: 2em;
        label
        {
            transform-style: preserve-3d;
            text-align: center;
            opacity: 1;
            color: $white;
            border: 1px solid $white;
            padding: 1.2em 1em;
            margin-top: 1em;
            border-radius: .2em;
            transition: opacity .2s ease-in-out;
        }
    }
    header
    {
        margin-bottom: 1.5em;
        padding-bottom: 1.5em;
        border-bottom: 1px dashed rgba($white, .8);
        h3 {
            font-size: 1.65em;
        }
    }
    @media screen and (max-width: 480px) {
        width: 90vw;
        height: auto;
        padding: 2.2em 2em;
        margin: 4em auto;
        align-items: center;
        flex-direction: column-reverse;
        .mobile-hide
        {
            display: none;
        }
        .info
        {
            // text-align: inherit;
            flex: auto;
            padding: 0;
            margin: 3em 0 0;
            label
            {
                margin-top: 2em;
            }
        }
    }
}

.svg-loader
{
    position: relative;
    &_grow
    {
        stroke-miterlimit: 10;
        stroke-dasharray: 500;
        stroke-dashoffset: -500;
        stroke-linejoin: round;
        stroke-linecap: round;
        @for $i from 0 to 101
        {
            &[aria-valuenow="#{$i}"]
            {
                stroke-dashoffset: 500 - ((500 * $i) / 100);
            }
        }
    }
    &_animate
    {
        animation: goBackGrow 20s $bezier infinite;
    }
    &_animate-color
    {
        animation: goBackColorGrow 4s ease-in-out infinite;
        &.reflect-x
        {
            animation-name: backGoGrow;
            animation-delay: .1s;
        }
    }
}

.logo
{
    fill: none;
    stroke: rgba($white, .6);
    stroke-miterlimit: 10;
    stroke-dasharray: 900;
    stroke-dashoffset: 200;
    stroke-linejoin: round;
    stroke-linecap: round;
    transform: scale(.4);
    transform-origin: 50% 50%;
    animation: backGoLogo 40s ease-in-out infinite;
}

@keyframes backGoLogo
{
    5%
    {
        stroke-dashoffset: 900;
    }
    20%,
    100%
    {
        stroke-dashoffset: 200;
    }
}
circle
{
    stroke-width: 6;

    transition: all 1s ease-in-out;
    position: relative;
    &.fat
    {
        stroke-width: 8;
    }
    &.thin
    {
        stroke-width: 2;
    }
    &.hair-line
    {
        stroke-width: 1;
    }
    @each $name, $value in $colorsList
    {
        &.#{$name}
        {
            stroke: $value;
        }
    }
}

@keyframes backGoGrow
{
    0%
    {
        stroke-dashoffset: 20;
    }
    50%
    {
        stroke-dashoffset: 480;
    }
    100%
    {
        stroke-dashoffset: 20;
    }
}

@keyframes goBackColorGrow
{
    0%
    {
        stroke-dashoffset: 480;
        stroke: $red;
    }
    50%
    {
        stroke-dashoffset: 20;
        stroke: $cyan;
    }
    100%
    {
        stroke-dashoffset: 480;
        stroke: $red;
    }
}


@keyframes goBackGrow
{
    0%
    {
        stroke-dashoffset: 480;
    }
    25%
    {
        stroke-dashoffset: 400;
    }
    50%
    {
        stroke-dashoffset: 50;
    }
    75%
    {
        stroke-dashoffset: 200;
    }
    100%
    {
        stroke-dashoffset: 480;
    }
}
!

JS
!
999px

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