CodePen

HTML

            
              <svg class="svg-defs">
  <defs>
        <clipPath id="clipping">
          <polygon id="Star-1" points="98.4999978 153.75 38.2520165 185.424245 49.7583542 118.337123 1.01670635 70.8257603 68.3760155 61.037872 98.5000012 1.1379786e-14 128.624005 61.0378871 195.98331 70.8258091 147.241642 118.337136 158.747982 185.424247"/>
          <text x="0" y="3.2em">Text</text>
        </clipPath>
        
        <linearGradient id="gradient" x1="0" y1="0" x2 ="110%" y2="0%">
          <stop stop-color="#fff" offset="0"/><stop stop-color="#fff" offset="10%"/>
          <stop stop-color="#AAA" offset="10%"/><stop stop-color="#AAA" offset="20%"/>
          <stop stop-color="#777" offset="20%"/><stop stop-color="#777" offset="30%"/>
          <stop stop-color="#333" offset="30%"/><stop stop-color="#333" offset="40%"/>
          <stop stop-color="#000" offset="40%"/><stop stop-color="#000" offset="50%"/>
          <stop stop-color="#fff" offset="50%"/><stop stop-color="#fff" offset="60%"/>
          <stop stop-color="#AAA" offset="60%"/><stop stop-color="#AAA" offset="70%"/>
          <stop stop-color="#777" offset="70%"/><stop stop-color="#777" offset="80%"/>
          <stop stop-color="#333" offset="80%"/><stop stop-color="#333" offset="90%"/>
          <stop stop-color="#000" offset="90%"/><stop stop-color="#000" offset="100%"/>
        </linearGradient>
    
        <mask id="masking" maskUnits="objectBoundingBox" maskContentUnits="objectBoundingBox">
          <rect y="0" width="1" height="1" fill="url(#gradient)" />
          <circle cx=".5" cy=".5" r=".42" fill="black" />
          
          <circle cx="0" cy=".5" r=".32" fill="black" />
          <circle cx="1" cy=".5" r=".32" fill="black" />
          
          <circle cx="0" cy=".5" r=".3" fill="gray" />
          <circle cx=".5" cy=".5" r=".4" fill="gray" />
          <circle cx="1" cy=".5" r=".3" fill="gray" />
          
          <circle cx="0" cy=".5" r=".25" fill="white" />
          <circle cx=".5" cy=".5" r=".35" fill="white" />
          <circle cx="1" cy=".5" r=".25" fill="white" />
        </mask>
    
        <pattern id="pattern" 
                 patternUnits="userSpaceOnUse"
                 width="200" height="300" 
                 viewbox="0 0 200 300">
          <image xlink:href="http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg" width="200" height="300" />
        </pattern>
   </defs>
</svg>

<div class="wrapper">
  <h1>CSS and SVG Masks</h1>
  <div class="item item--clip">
    <div class="demo">
      <img src="http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg" alt="" class="has-mask"/>
    </div>
    <div class="text">
      <h3>CSS clip</h3>
      <a href="http://www.w3.org/TR/2014/WD-css-masking-1-20140213/#clip-property">Specification</a>
      <br /><br />
      <code class="code--css"><pre>.item {
  position: absolute;
  clip: rect(10px, 190px, 190px, 10px);
  }</pre></code>
      <ul class="browsers">
        <li class="browser chrome has-support"></li>
        <li class="browser safari has-support"></li>
        <li class="browser opera-13 has-support"></li>
        <li class="browser firefox has-support"></li>
        <li class="browser ie9 has-support"></li>
        <li class="browser opera-12 has-support"></li>
      </ul>
    </div>  
  </div>
  <!-- ********* -->   
  <div class="item item--css-clip-path">
    <div class="demo">
       <img src="http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg" alt="" />
    </div>  
    <div class="text">
      <h3>CSS clip-path</h3>
      <a href="http://www.w3.org/TR/2014/WD-css-masking-1-20140213/#the-clip-path">Specification</a>
      <br /><br />
      <code class="code--css"><pre>.item {
  <del>clip-path: circle(100px, 100px, 100px);</del>
  clip-path: circle(100px at center);
  }</pre></code>
      Syntax for circle <a href="http://dev.w3.org/csswg/css-shapes/#20130620">was chnaged</a>, to radial gradient syntax

      <ul class="browsers">
        <li class="browser chrome has-support"></li>
        <li class="browser safari has-support"></li>
        <li class="browser opera-13 has-support"></li>
        <li class="browser firefox"></li>
        <li class="browser ie9"></li>
        <li class="browser opera-12"></li>
      </ul>
    </div> 
  </div>
 <!-- ********* -->   
 <div class="item item--svg-clip-path-svg">
    <div class="demo">
      <svg width="200" height="300">
        <image xlink:href="http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg" width="200" height="300" />
      </svg>
    </div>  
    <div class="text">
      <h3>SVG clip-path for SVG elements</h3>
      <a href="http://www.w3.org/TR/SVG11/masking.html#EstablishingANewClippingPath">Specification</a>
      <br /><br />
      <code class="code--svg"><pre>&lt;clipPath id="clipping">
  &lt;polygon points="98.4999978 153.75..."/>
&lt;/clipPath></pre></code>
      <code class="code--css"><pre>.item {
  clip-path: url(#clipping);
  }</pre></code>
      <ul class="browsers">
        <li class="browser chrome has-support"></li>
        <li class="browser safari has-support"></li>
        <li class="browser opera-13 has-support"></li>
        <li class="browser firefox has-support"></li>
        <li class="browser ie9 has-support"></li>
        <li class="browser opera-12 has-support"></li>
      </ul>
    </div>  
  </div>
 <!-- ********* -->   
  <div class="item item--svg-clip-path-html">
    <div class="demo">
       <img src="http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg" alt="" />
    </div>  
    <div class="text">
      <h3>SVG clip-path for HTML elements</h3>
      <a href="http://www.w3.org/TR/2014/WD-css-masking-1-20140213/#svg-clipping-paths">Specification</a>
      <br /><br />
      <code class="code--svg"><pre>&lt;clipPath id="clipping">
  &lt;polygon points="98.4999978 153.75..."/>
&lt;/clipPath></pre></code>
      <code class="code--css"><pre>.item {
  clip-path: url(#clipping);
  }</pre></code>
      <ul class="browsers">
        <li class="browser chrome"></li>
        <li class="browser safari"></li>
        <li class="browser opera-13"></li>
        <li class="browser firefox has-support"></li>
        <li class="browser ie9"></li>
        <li class="browser opera-12"></li>
      </ul>
    </div> 
  </div>
 
 <!-- ********* -->   
  <div class="item item--css-mask">
    <div class="demo">
       <img src="http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg" alt="" />
    </div>  
    <div class="text">
      <h3>CSS mask-image</h3>
      <a href="http://www.w3.org/TR/2014/WD-css-masking-1-20140213/#the-mask-image">Specification</a>
      <br /><br />
      <code class="code--css"><pre>.item {
  mask-image: url(YOUR.png), 
                    linear-gradient(-45deg,
                        rgba(0,0,0,1) 20%, rgba(0,0,0,0) 50%);
  mask-repeat: space;
  }</pre></code>
      Mask image: <a href="http://img-fotki.yandex.ru/get/9492/5091629.9d/0_80e74_9f303e3d_M.png">PNG</a>
      <ul class="browsers">
        <li class="browser chrome has-support"></li>
        <li class="browser safari has-support"></li>
        <li class="browser opera-13 has-support"></li>
        <li class="browser firefox"></li>
        <li class="browser ie9"></li>
        <li class="browser opera-12"></li>
      </ul>
    </div> 
  </div>
 <!-- ********* -->
  <div class="item item--svg-mask-svg">
    <div class="demo">
      <svg width="200" height="300">
      <image xlink:href="http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg"
      width="200" height="300"
      /></svg>
    </div>  
    <div class="text">
       <h3>SVG mask for SVG elements</h3>
      <a href="http://www.w3.org/TR/SVG11/masking.html#Masking">Specification</a>
      <br /><br />
      <code class="code--svg"><pre>&lt;mask id="masking" maskUnits="objectBoundingBox" 
  maskContentUnits="objectBoundingBox">
  &lt;rect y="0" width="1" height="1" fill="url(#gradient)" />
  &lt;circle cx=".5" cy=".5" r=".4" fill="gray" />
  &lt;circle cx=".5" cy=".5" r=".3" fill="white" />
  ...
&lt;/mask></pre></code>
      <code class="code--css"><pre>.item {
  mask: url(#masking);
  }</pre></code>
      <ul class="browsers">
        <li class="browser chrome has-support"></li>
        <li class="browser safari has-support"></li>
        <li class="browser opera-13 has-support"></li>
        <li class="browser firefox has-support"></li>
        <li class="browser ie9 has-support"></li>
        <li class="browser opera-12 has-support"></li>
      </ul>
    </div> 
  </div> 
<!-- ********* --> 
  <div class="item item--svg-mask-html">
    <div class="demo">
      <img src="http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg" alt="" />
    </div>  
    <div class="text">
      <h3>SVG mask for HTML elements</h3>
      <a href="http://www.w3.org/TR/2014/WD-css-masking-1-20140213/#the-mask-image">Specification</a>
      <br /><br />
      <code class="code--svg"><pre>&lt;mask id="masking" maskUnits="objectBoundingBox" 
  maskContentUnits="objectBoundingBox">
  &lt;rect y="0" width="1" height="1" fill="url(#gradient)" />
  &lt;circle cx=".5" cy=".5" r=".4" fill="gray" />
  &lt;circle cx=".5" cy=".5" r=".3" fill="white" />
  ...
&lt;/mask></pre></code>
      <code class="code--css"><pre>.item {
  mask: url(#masking);
  }</pre></code>
      <ul class="browsers">
        <li class="browser chrome"></li>
        <li class="browser safari"></li>
        <li class="browser opera-13"></li>
        <li class="browser firefox has-support"></li>
        <li class="browser ie9"></li>
        <li class="browser opera-12"></li>
      </ul>
    </div>
  </div>

 <!-- ********* --> 
  <div class="item item--css-background-clip">
    <div class="demo">
      Text
    </div>  
    <div class="text">
       <h3>background-clip</h3>
      <a href="https://www.webkit.org/blog/164/background-clip-text/">Documentation</a>
      <br /><br />
      <code class="code--css"><pre>.item {
  background: url(YOUR IMAGE) no-repeat;
  -webkit-text-fill-color: transparent;
  -webkit-background-clip: text;
  }</pre></code>
      <ul class="browsers">
        <li class="browser chrome has-support"></li>
        <li class="browser safari has-support"></li>
        <li class="browser opera-13 has-support"></li>
        <li class="browser firefox"></li>
        <li class="browser ie9"></li>
        <li class="browser opera-12"></li>
      </ul>
    </div> 
  </div>
 <!-- ********* --> 
  <div class="item item--svg-fill">
    <div class="demo">
      <svg width="200" height="200">
        <text x="0" y="1em">Text</text>
      </svg>  
    </div>  
    <div class="text">
       <h3>SVG fill</h3>
      <a href="http://www.w3.org/TR/SVG/painting.html#FillProperties">Specification</a> 
      <br /><br />
      <div class="comment">Not real mask, but looks like <code>-webkit-background-clip: text;</code> and has much better support.</div>
      <br /><br />
      <code class="code--svg"><pre>&lt;pattern id="pattern" patternUnits="userSpaceOnUse"
             width="200" height="300" viewbox="0 0 200 300">
  &lt;image xlink:href="YOUR IMAGE" width="200" height="300" />
&lt;/pattern></pre></code>
      <code class="code--css"><pre>text {
  fill: url(#pattern);
  }</pre></code>
      <ul class="browsers">
        <li class="browser chrome has-support"></li>
        <li class="browser safari has-support"></li>
        <li class="browser opera-13 has-support"></li>
        <li class="browser firefox has-support"></li>
        <li class="browser ie9 has-support"></li>
        <li class="browser opera-12 has-support"></li>
      </ul>
    </div> 
  </div> 
</div>


<!--  

http://www.html5rocks.com/en/tutorials/masking/adobe/#toc-masking
http://habrahabr.ru/post/190246/
https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-mask-image
https://developer.mozilla.org/en-US/docs/Web/CSS/mask
http://thenittygritty.co/css-masking
http://stackoverflow.com/questions/18792402/css-webkit-mask-image
https://developer.apple.com/library/safari/documentation/InternetWeb/Conceptual/SafariVisualEffectsProgGuide/Masks/Masks.html
http://www.xiper.net/manuals/css-extensions/webkit/properties/webkit-mask.html
-->

            
          
!

↑ Insert the most common viewport meta tag

CSS

            
              b {
  font-weight: bold;
}
i {
  font-style: italic;
}
.item--clip .demo {
  width: 200px;
  height: 250px;
  }
.item--clip .has-mask {
  position: absolute;
  clip: rect(10px, 190px, 190px, 10px);
  }

.item--css-clip-path img {
  -webkit-clip-path: circle(100px at center);
  -moz-clip-path: circle(100px, 100px, 100px);
  clip-path: circle(100px, 100px, 100px);
  }

.item--svg-clip-path-svg image,
.item--svg-clip-path-html img {
  clip-path: url(#clipping);
  }

.item--css-mask img {
  mask-image: url(http://img-fotki.yandex.ru/get/9492/5091629.9d/0_80e74_9f303e3d_M.png), 
  linear-gradient(-45deg,
    black 20%, transparent 50%);
  mask-repeat: space;
  }

.item--svg-mask-html img,
.item--svg-mask-svg image{
  mask: url(#masking);
}

.item--css-background-clip .demo {
  width: 200px;
  height: 200px;
  background: url(http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg) no-repeat;
  -webkit-text-fill-color: transparent;
  -webkit-background-clip: text;
}

.item--svg-fill text {
  fill: url(#pattern);
}

.demo, 
#clipping,
#masking text {
  font: bold italic 7em/1.5 Georgia;
  }

/* Common 
------------------------------------------- */

BODY {
  font: 12px/1.4 "Trebuchet MS", Arial, sans-serif;
  }
A {
  color: tomato;
  }
H1, H2, H3, H4 {
  margin-bottom: 1rem;
  font-family: Georgia, serif;
  line-height: 1.4;
  }
H1 {
  position: relative;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #CCC;
  text-align: center;
  text-shadow: 1px 1px 0 white,
               2px 2px 0 #555;
  font-size: 4em;  
  font-style: italic;
  &:after {
    content: "Live demo";
    position: absolute;
    margin-left: 5px;
    padding: 1px 5px;
    vertical-align: top;
    border-radius: 5px;
    background: paleturquoise;
    white-space: nowrap;
    text-shadow: none;
    font-size: 1rem;
    color: #FFF;
    }
  }

H2 {
  padding-bottom: .3rem;
  border-bottom: 1px solid #333;
  font-size: 2.8em;
  color: #333;
  }
H3 {
  text-shadow: 1px 1px 0 white,
               2px 2px 0 #CCC;
  font-size: 2.5em;
  font-style: italic;
  color: #777;
  }
H4 {
  font-size: 1.6em;
  font-style: italic;
  color: #999;
  }

$css-code-color: hsl(50, 80%, 75%);
$svg-code-color: hsl(75, 70%, 75%);
$code-header-height: 25px;

code {
  display: block;
  position: relative;
  margin-bottom: 1rem;
  overflow: auto;
  max-width: 90%;
  padding: $code-header-height + 10px 10px 7px;
  border-radius: 5px;
  .comment & {
    display: inline-block;
    margin: 0;
    padding: 2px 5px;
    vertical-align: middle;
    background: #EEE;
    color: #777;
    } 
  &:before {
    left: 0;
    right: 0;
    top: 0;
    height: $code-header-height;
    line-height: $code-header-height + .2;
    padding-left: 10px;
    position: absolute;
    font-weight: bold;
    font-style: italic;
    }
  .comment &:before {
    content: none;
    }
  }
.code--css {
  background: lighten($css-code-color,10%);
  &:before {
    content: "CSS";
    background: $css-code-color;
    color: darken($css-code-color,45%);
    }
  }
.code--svg {
  background: lighten($svg-code-color,10%);
  &:before {
    content: "SVG";
    background: $svg-code-color;
    color: darken($svg-code-color,45%);
    }
  }

.svg-defs {
  position: absolute;
  width: 0;
  height: 0;
  }

.wrapper {
  width: 90%;
  min-width: 500px;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 0;
  conter-reset: mylist;
  &:after {
    content: '';
    display: table;
    width: 100%;
    clear: both;
    }
  }

.item {
  position: relative;
  margin-bottom: 2em;
  padding-bottom: 2em;
  padding-right: 3em;
  border-bottom: 1px solid #DDD;
  counter-increment: mylist;
  
  &:before {
    content: counter(mylist);
    position: absolute;
    right: 0;
    top: 0;
    font: 2rem/1 Georgia, serif;
    color: #EEE;
    }
  &:after {
    content: '';
    display: table;
    width: 100%;
    }
  }  

  .demo {
    position: relative;
    float: left;
    margin-right: 30px;
    &:before {
      content: '';
      display: block;
      position: absolute;
      z-index: -2;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      background: url(http://img-fotki.yandex.ru/get/5607/5091629.6b/0_612e6_b9039c0d_M.jpg) no-repeat;
      opacity: 0;
      transition: .7s;
      }
   .item:hover &:before {
        opacity: .4;
        }
    }
.text {
  padding-left: 230px;
  }
/* Browsers
------------------------------- */

.browsers {
  margin-top: 1.5rem;
  }
.browser {
  display: inline-block;
  opacity: .2;
  }
  .has-support {
    opacity: 1;
    }
.browser:before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 24px;
  margin-right: 7px;
  background: url(http://yoksel.github.io/assets/img/sprite-browsers.png) 0 0 no-repeat;
  vertical-align: middle;
}

.firefox:before {
  background-position: 0 0;
  }
.chrome:before {
  background-position: -30px 0;
  }
.safari:before {
  background-position: -60px 0;
  }
.ie8:before {
  background-position: -90px 0;
  }
.ie9:before {
  background-position: -90px 0;
  }
.opera-13:before {
  background-position: -120px 0;
  }
.opera-12:before {
  background-position: -150px 0;
  }
.opera-mob:before {
  background-position: -150px 0;
  }
.opera-mini:before {
  background-position: -150px 0;
  }
            
          
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