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CSS

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CSS Base

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HTML 

              
                <h1>Photoshop-Style Drop-Shadows Using Web filters </h1>
<div class="summary">This demo uses SVG filters to duplicate PhotoShop's drop shadow control. </br></br>
  
Things to note: applying an SVG filter to HTML text via a CSS filter clips the shadow to a specific region around HTML text (In SVG, this region's size is configurable). 

Browser errata: Safari: CSS filters don't yet support SVG compositing so it won't show a drop shadow on the HTML text. IE: while the output works fine on SVG text, IE doesn't support CSS filters yet, and the form inputs below don't quite work (range and event detection problems).</div>

<table id="master-container">
<tr>
  <td id="text-container">
  <svg height="200px" width="300px" viewbox="0 0 300 200">
    <defs>
      <filter id="drop-shadow" color-interpolation-filters="sRGB" x="-50%" y="-50%" height="200%" width="200%">

<!-- Take source alpha, offset it by angle/distance and blur it by size     -->
        <feOffset id="offset" in="SourceAlpha" dx="3.54" dy="3.54" result="SA-offset"/>
        <feGaussianBlur id="blur" in="SA-offset" stdDeviation="3" result="SA-o-blur"/>
        
<!-- Apply a contour by using a color curve transform on the alpha and clipping the result to the input  -->        
        <feComponentTransfer in="SA-o-blur" result="SA-o-b-contIN">
          <feFuncA id="contour" type="table" tableValues="0 1"/>
        </feComponentTransfer>
        
        <feComposite operator="in" in="SA-o-blur" in2="SA-o-b-contIN" result="SA-o-b-cont"/>
        
<!-- Adjust the spread by multiplying alpha by a constant factor      -->          
        <feComponentTransfer in="SA-o-b-cont" result="SA-o-b-c-sprd">
          <feFuncA id="spread-ctrl" type="linear" slope="1"/>
        </feComponentTransfer>        
        
        
<!-- Adjust color and opacity by adding fixed offsets and an opacity multiplier --> 
        
         <feColorMatrix id="recolor" in="SA-o-b-c-sprd" type="matrix" 
                                                      values="1 0 0 0 0
                                                              0 1 0 0 0
                                                              0 0 1 0 0 
                                                              0 0 0 .8 0"
                       result="SA-o-b-c-s-recolor"/>       
        
<!-- Generate a reasonably grainy noise input with baseFrequency of .5 to 2.0, and add the noise with a k1 multiplier, and a k2 that add to 1 -->         
        <feTurbulence result="fNoise" type="fractalNoise" numOctaves="6" baseFrequency="1.98"/>
        <feColorMatrix in="fNoise" type="matrix" values="1 0 0 0 0
                                                         0 1 0 0 0
                                                         0 0 1 0 0 
                                                         0 0 0 7 -3"
                                         result="clipNoise"/>
        <feComposite id="noisemix" operator="arithmetic" in="SA-o-b-c-s-recolor" in2="clipNoise" k1="0" k2="1" result="SA-o-b-c-s-r-mix"/>
        
<!-- Merge the shadow with the original --> 
        
        <feMerge>
          <feMergeNode in="SA-o-b-c-s-r-mix"/>
          <feMergeNode in="SourceGraphic"/>
        </feMerge>
      </filter>
    </defs>
    <text filter="url(#drop-shadow)" x="70" y="100">SVG </text>
    <text filter="url(#drop-shadow)" x="70" y="180">Text</text>
                              
  </svg>
    <h2>HTML</h2>
    <h2>Text</h2>
  </td>
  <td>
  
<div id="control-container">
  <table>
     <tr>
      <td>Color</td>
      <td><input type="color" id="drop-color" value="#000000"/>
      </td>
    </tr>
    <tr>
      <td>Opacity %</td>
      <td><input type="range" id="drop-opacity" min="0" max="1" step=".01" value=".8"/>
      </td>
    </tr>   
    <tr>
      <td>Angle (deg)</td>
      <td><input type="range" id="drop-angle" min="0" max="360" step="1" value="135"/>
      </td>
    </tr>
    <tr>
      <td>Distance (px)</td>
      <td><input type="range" id="drop-dist" min="0" max="40" step="0.5" value="5"/>
      </td>
    </tr>   
    <tr>
      <td>Spread (x)</td>
      <td><input type="range" id="drop-spread" min="0" max="1" step="0.01" value="0"/>
      </td>
    </tr>   
    <tr>
      <td>Size (px)</td>
      <td><input type="range" id="drop-size" min="1" max="15" step="0.25" value="3"/>
      </td>
    </tr>   
    <tr>
      <td valign="top" style="padding-top:8px">Contour</td>
      <td style="padding-left:8px">
        <svg width="160px" height="120px" viewbox="0 0 160 120">
          
          <!--Contour boxes -->
          
           <!--Row 1 -->
           <rect stroke="#333" fill="white" x="7%" y="9%" width="19%" height="26%"/> 
            <path  d="M13,40 l26,-28 0,28z"  fill="#333"/>
           <rect stroke="#333" fill="white"  x="29%" y="9%" width="19%" height="26%"/> 
             <path  d="M48,40 Q62,-13 75,40z"  fill="#333"/>
           <rect stroke="#333" fill="white"  x="51%" y="9%" width="19%" height="26%"/> 
            <path  d="M83,14 Q95.5,58 110,14 l0,26 -27,0z"  fill="#333"/>
           <rect stroke="#333" fill="white"  x="73%" y="9%" width="19%" height="26%"/> 
            <path  d="M119,30 q15,00 18,-16 l8,0 0,26 -26,0z" fill="#333"/>
          
            <!--Row 2 -->
            <rect stroke="#333" fill="white" x="7%" y="40%" width="19%" height="26%"/> 
            <path  d="M13,62 q7,0 12,-11 l14,0 0,26 -26,0z" fill="#333"/>
           <rect stroke="#333" fill="white"  x="29%" y="40%" width="19%" height="26%"/> 
             <path  d="M48,77 q9,0 13,-13 t13,-13 l0,26z"  fill="#333"/>
           <rect stroke="#333" fill="white"  x="51%" y="40%" width="19%" height="26%"/> 
            <path  d="M83,77 q7,-26 26,-26 l0,26z"  fill="#333"/>
           <rect stroke="#333" fill="white"  x="73%" y="40%" width="19%" height="26%"/> 
            <path  d="M118,77 q4,-6 4.5,-13 t4.5,-13 q4,6 4.5,13 t4.5,13 q4,-6 4.5,-13 t4.5,-13  l0,26z" fill="#333"/>
 

             <!--Row 3 -->        
           <rect stroke="#333" fill="white" x="7%" y="71%" width="19%" height="26%"/> 
            <path  d="M12,114 
                      q3,-10 3,-17 t3,-9   
                      q3,3 3,9 t3,17 
                      q3,-10 2.5,-17 t2.5,-9      
                      q3,3 2.5,9 t2.5,17 
                      q3,-10 3,-17 t3,-9 
                      l0,26z"  fill="#333"/>
           <rect stroke="#333" fill="white"  x="29%" y="71%" width="19%" height="26%"/> 
             <path  d="M48,88 c10,40 15,-15 26,26 l-26,0z" fill="#333"/>   
          <rect stroke="#333" fill="white"  x="51%" y="71%" width="19%" height="26%"/> 
            <path  d="M83,114 q0,-9 7,-9 q0,-7 7,-7 q0,-5 6,-5 q0,-3 6,-3 l0,24z"  fill="#333"/>
           <rect stroke="#333" fill="white"  x="73%" y="71%" width="19%" height="26%"/> 
            <path  d="M118,114 l7,-13 7,13,7,-13,7,13z" fill="#333"/>
          
          <!--Overlay boxes to capture clicks -->
           <!--Row 1 -->
           <rect id="contour-0" fill-opacity=".01" x="7%" y="9%" width="19%" height="26%"/>
           <rect id="contour-1" fill-opacity=".2"  x="29%" y="9%" width="19%" height="26%"/> 
           <rect id="contour-2" fill-opacity=".2"  x="51%" y="9%" width="19%" height="26%"/> 
           <rect id="contour-3" fill-opacity=".2"  x="73%" y="9%" width="19%" height="26%"/>
            <!--Row 2 -->
           <rect id="contour-4" fill-opacity=".2" x="7%" y="40%" width="19%" height="26%"/> 
           <rect id="contour-5" fill-opacity=".2"  x="29%" y="40%" width="19%" height="26%"/> 
           <rect id="contour-6" fill-opacity=".2"  x="51%" y="40%" width="19%" height="26%"/> 
           <rect id="contour-7" fill-opacity=".2"  x="73%" y="40%" width="19%" height="26%"/> 
           <!--Row 3 -->        
           <rect  id="contour-8" fill-opacity=".2" x="7%" y="71%" width="19%" height="26%"/> 
           <rect  id="contour-9" fill-opacity=".2"  x="29%" y="71%" width="19%" height="26%"/> 
           <rect  id="contour-10" fill-opacity=".2"  x="51%" y="71%" width="19%" height="26%"/> 
           <rect  id="contour-11" fill-opacity=".2"  x="73%" y="71%" width="19%" height="26%"/> 


        </svg>
      </td>
    </tr>   
    <tr>
       <td>Noise %</td>
      <td><input type="range" id="drop-noise" min="0" max="1" step="0.01" value="0"/>
      </td>
    </tr>
  
  </table>
  </td>
  </tr>
</table>
  
  
 <div id="filter-code">
   <p>
        &lt;filter id=&quot;drop-shadow&quot; color-interpolation-filters=&quot;sRGB&quot; x=&quot;-50%&quot; y=&quot;-50%&quot; height=&quot;200%&quot; width=&quot;200%&quot;&gt;
   </p>
&lt;!-- Take source alpha, offset it by angle/distance and blur it by size     --&gt;
       <p>    &lt;feOffset id=&quot;offset&quot; in=&quot;SourceAlpha&quot; dx=&quot;<span id="dispdx">3.54</span>&quot; dy=&quot;<span id="dispdy">3.54</span>&quot; result=&quot;SA-offset&quot;/&gt;
      </br>
        &lt;feGaussianBlur id=&quot;blur&quot; in=&quot;SA-offset&quot; stdDeviation=&quot;<span id="dispsize">3</span>&quot; result=&quot;SA-o-blur&quot;/&gt;
    <p>       
&lt;!-- Apply a contour by using a color curve transform on the alpha and clipping the result to the input --&gt;        
  <p>      &lt;feComponentTransfer in=&quot;SA-o-blur&quot; result=&quot;SA-o-b-contIN&quot;&gt;
 </br>      &nbsp;    &lt;feFuncA id=&quot;contour&quot; type=&quot;table&quot; tableValues=&quot;<span id="dispcontour">0 1</span>&quot;/&gt;
      </br>      &lt;/feComponentTransfer&gt;
        
<p>        &lt;feComposite operator=&quot;in&quot; in=&quot;SA-o-blur&quot; in2=&quot;SA-o-b-contIN&quot; result=&quot;SA-o-b-cont&quot;/&gt;
        
<p>  &lt;!-- Adjust the spread by multiplying alpha by a constant factor      --&gt;          
        &lt;feComponentTransfer in=&quot;SA-o-b-cont&quot; result=&quot;SA-o-b-c-sprd&quot;&gt;
    </br> &nbsp;      &lt;feFuncA id=&quot;spread-ctrl&quot; type=&quot;linear&quot; slope=&quot;<span id="dispspread">1</span>&quot;/&gt;
    </br>      &lt;/feComponentTransfer&gt;        
        
        
   <p>  &lt;!-- Adjust color and opacity by adding fixed offsets and an opacity multiplier --&gt; 
        
 </br>          &lt;feColorMatrix id=&quot;recolor&quot; in=&quot;SA-o-b-c-sprd&quot; type=&quot;matrix&quot; 
                                                      values=&quot;<span id="dispcolmatrix"/>1 0 0 0 0
                                                              0 1 0 0 0
                                                              0 0 1 0 0 
   0 0 0 .8 0</span>&quot;
                       result=&quot;SA-o-b-c-s-recolor&quot;/&gt;       
        
<p>  &lt;!-- Generate a reasonably grainy noise input with baseFrequency between approx .5 to 2.0. And add the noise with k1 and k2 multipliers that sum to 1 --&gt;         
    </br>      &lt;feTurbulence result=&quot;fNoise&quot; type=&quot;fractalNoise&quot; numOctaves=&quot;6&quot; baseFrequency=&quot;1.98&quot;/&gt;
     </br>     &lt;feColorMatrix in=&quot;fNoise&quot; type=&quot;matrix&quot; values=&quot;1 0 0 0 0
                                                         0 1 0 0 0
                                                         0 0 1 0 0 
                                                         0 0 0 7 -3&quot;
                                         result=&quot;clipNoise&quot;/&gt;
      </br>    &lt;feComposite id=&quot;noisemix&quot; operator=&quot;arithmetic&quot; in=&quot;SA-o-b-c-s-recolor&quot; in2=&quot;clipNoise&quot; k1=&quot;<span id="dispk1">0</span>&quot; k2=&quot;<span id="dispk2">1</span>&quot; result=&quot;SA-o-b-c-s-r-mix&quot;/&gt;
        
<p>  &lt;!-- Merge the shadow with the original --&gt; 
        
  </br>         &lt;feMerge&gt;
   </br> &nbsp;         &lt;feMergeNode in=&quot;SA-o-b-c-s-r-mix&quot;/&gt;
  </br>  &nbsp;     &lt;feMergeNode in=&quot;SourceGraphic&quot;/&gt;
  </br>      &lt;/feMerge&gt;
  </br>    &lt;/filter&gt;
  </div>
!

CSS 

              
                H1 {
    font-family: sans-serif;
    position: relative;
    left: 12%;
}

H2 {
    font-family: sans-serif;
    position: relative;
    left: 60px;
    font-size: 4.5em;
    line-height: 0.3em;
    -webkit-filter: url(#drop-shadow);
    -moz-filter: url(#drop-shadow);
    -ms-filter: url(#drop-shadow);
    filter: url(#drop-shadow);
}

div {
  font-family: sans-serif;
}

#master-container {
  position: relative;
  left: 16%;
}

#control-container{
  left: 50px;
  width: 300px;
  background-color: #aaa;
  border: 10px solid #aaa;
  padding: 5px;
}

#text-container{
  position: relative;
  width: 300px;
  border: 1px solid #bbb;
}

.summary {
  position:relative ;
  width:600px;
  left: 16%;
  margin: 40px;

}

#filter-code {
  font-family: monospace;
  position: relative;
  padding: 16px;
  left: 14%;
  width: 700px;
}

td {
  padding:3px;
  font-family: sans-serif;
}


svg{
  font-size: 4em;
  font-family: arial;
  font-weight: bold;
}


input[type=range] {
    width: 150px;
    height: 10px;
    margin: 10px 0 10px 10px;
}

input[type=color] {
    width: 150px;
    margin: 10px 0 9px 10px;
}
!

JS 

              
                 //Set up variables for form inputs and add change handlers

    var colorInput = document.getElementById("drop-color");
    var opacInput = document.getElementById("drop-opacity");
    var angleInput = document.getElementById("drop-angle");
    var distInput = document.getElementById("drop-dist");
    var spreadInput = document.getElementById("drop-spread");
    var sizeInput= document.getElementById("drop-size");
    var noiseInput= document.getElementById("drop-noise");
    
   var contourInput = new Array(12);
     contourInput[0]=document.getElementById("contour-0");
     contourInput[1]=document.getElementById("contour-1");
     contourInput[2]=document.getElementById("contour-2");
     contourInput[3]=document.getElementById("contour-3");
     contourInput[4]=document.getElementById("contour-4");
     contourInput[5]=document.getElementById("contour-5");
     contourInput[6]=document.getElementById("contour-6");
     contourInput[7]=document.getElementById("contour-7");
     contourInput[8]=document.getElementById("contour-8");
     contourInput[9]=document.getElementById("contour-9");
     contourInput[10]=document.getElementById("contour-10");
     contourInput[11]=document.getElementById("contour-11");

   contourInput[0].addEventListener('click', function(){changeContour("0")}, false);
   contourInput[1].addEventListener('click', function(){changeContour("1")}, false);
   contourInput[2].addEventListener('click', function(){changeContour("2")}, false);
   contourInput[3].addEventListener('click', function(){changeContour("3")}, false);
   contourInput[4].addEventListener('click', function(){changeContour("4")}, false);
   contourInput[5].addEventListener('click', function(){changeContour("5")}, false);
   contourInput[6].addEventListener('click', function(){changeContour("6")}, false);
   contourInput[7].addEventListener('click', function(){changeContour("7")}, false);
   contourInput[8].addEventListener('click', function(){changeContour("8")}, false);
   contourInput[9].addEventListener('click', function(){changeContour("9")}, false);
   contourInput[10].addEventListener('click', function(){changeContour("10")}, false);
   contourInput[11].addEventListener('click', function(){changeContour("11")}, false);

  var activeContour="0";

    colorInput.addEventListener('input', changeColor, false);
    opacInput.addEventListener('input', changeColor, false);
    angleInput.addEventListener('input', changeOffset, false);
    distInput.addEventListener('input', changeOffset, false);
    spreadInput.addEventListener('input', changeShadow, false);
    sizeInput.addEventListener('input', changeShadow, false);
    noiseInput.addEventListener('input', changeShadow, false);


//  Setup variables for filter primitives
    var colMatrixPrim = document.getElementById("recolor");
    var offsetPrim = document.getElementById("offset");
    var spreadPrim = document.getElementById("spread-ctrl");
    var sizePrim = document.getElementById("blur");
    var contourPrim = document.getElementById("contour");
    var noisePrim = document.getElementById("noisemix");

// Setup variables for source code text
    var dispDX = document.getElementById("dispdx");
    var dispDY = document.getElementById("dispdy");
    var dispSPREAD = document.getElementById("dispspread");
    var dispSIZE = document.getElementById("dispsize");
    var dispK1 = document.getElementById("dispk1");
    var dispK2 = document.getElementById("dispk2");
    var dispCONTOUR = document.getElementById("dispcontour");
    var dispCOLMATRIX = document.getElementById("dispcolmatrix");


//  Setup variables for array of contour values
    var contourArrays = new Array(11);
      contourArrays[0]="0 1";
      contourArrays[1]="0 .1 .5 .8 .9 1 .9 .8 .5 .1 0";
      contourArrays[2]="0 1 .3 .1 0.05 .1 .3 1 ";
      contourArrays[3]="0 0.4 0.45 0.5 0.62 0.87 1 1";
      contourArrays[4]="0.65 0.68 0.75 0.95 1 1 1 ";
      contourArrays[5]="0 0.05 0.15 0.4 0.5 0.6 0.85 0.95 1";
      contourArrays[6]="0 0.2 0.45 0.6 0.7 0.8 0.85 0.9 0.95 1 ";
      contourArrays[7]="0 0.05 0.15 0.45 0.7 0.85 0.95 1 0.95 0.85 0.7 0.45 0.15 0.05 0 0.05 0.15 0.45 0.7 0.85 0.95 1";
      contourArrays[8]="0 0.05 0.15 0.45 0.7 0.85 0.95 1 0.95 0.85 0.7 0.45 0.15 0.05 0 0.05 0.15 0.45 0.7 0.85 0.95 1 0.95 0.85 0.7 0.45 0.15 0.05 0 0.05 0.15 0.45 0.7 0.85 0.95 1";
      contourArrays[9]="0 1 0.65 0.5 0.55 0.6 0.65 0.55 0.4 0.1 0";
      contourArrays[10]="0 0.2 0.25 0.4 0.45 0.6 0.65 0.8 0.85";
      contourArrays[11]="0 .5 0 .5 0";

//  Functions

    function changeColor() {
      var redVal=Math.round(((hexToRgb(colorInput.value).r)/255)*1000)/1000;
      var greenVal=Math.round(((hexToRgb(colorInput.value).g)/255)*1000)/1000;
      var blueVal=Math.round(((hexToRgb(colorInput.value).b)/255)*1000)/1000;
      var opacVal=opacInput.value;
      var matrixValues="0 0 0 0 " + redVal + " 0 0 0 0 " + greenVal + " 0 0 0 0 " + blueVal + " 0 0 0 " + opacVal + " 0";
      colMatrixPrim.setAttribute("values", matrixValues);
      
      dispCOLMATRIX.innerHTML=matrixValues;
    };

   function changeOffset(){
     var xOffset= distInput.value * Math.sin(angleInput.value*(Math.PI/180));
     var yOffset= distInput.value * Math.cos(angleInput.value*(Math.PI/180));   
     offsetPrim.setAttribute("dx", xOffset);
     offsetPrim.setAttribute("dy", yOffset);
     dispDX.innerHTML = (Math.round((xOffset*100)))/100;
     dispDY.innerHTML = (Math.round((yOffset*100)))/100;
   };

  function changeShadow(){
    spreadPrim.setAttribute("slope", (spreadInput.value*10)+1);
    sizePrim.setAttribute("stdDeviation", sizeInput.value);
    noisePrim.setAttribute("k1", noiseInput.value);
    noisePrim.setAttribute("k2", 1-noiseInput.value);    
    
    dispSPREAD.innerHTML = Math.round((spreadInput.value*10+1)*100)/100;
    dispSIZE.innerHTML = sizeInput.value;
    dispK1.innerHTML = noiseInput.value;
    dispK2.innerHTML = Math.round((1-noiseInput.value)*100)/100;
  };

function changeContour(contourNum){
   contourPrim.setAttribute("tableValues", contourArrays[contourNum]);
   contourInput[contourNum].setAttribute("fill-opacity", ".01");
   contourInput[activeContour].setAttribute("fill-opacity", ".2");

   dispCONTOUR.innerHTML=contourArrays[contourNum];
  
   activeContour=contourNum;
  };


function hexToRgb(hex) {
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return result ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16)
    } : null;
}
!
999px

Console