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HTML

              
                <html>
  <head>
    <title>URL-encoder for SVG</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div class="wrapper">
      <header class="header">
        <h1>URL-encoder for SVG</h1>
      </header>

      <main>
        <div class="panel">

          <div class="options">
              External quotes:
              <label class="options__label">
                <input
                  type="radio"
                  value="single"
                  name="quotes"
                  class="options__input visuallyhidden"
                >
                <span class="options__text">single</span>
              </label>

              <span class="options__middle-word">/</span>

              <label class="options__label">
                <input
                  type="radio"
                  value="double"
                  name="quotes"
                  class="options__input visuallyhidden"
                  checked
                >
                <span class="options__text">double</span>
              </label>
          </div>


          <dl class="about">
            <dt class="expander">About tool</dt>
            <dd class="expanded hidden">
              <p>We can use SVG in CSS via data URI, but without encoding it works only in Webkit based browsers. If encode SVG using <code>encodeURIComponent()</code> it will work everywhere.</p>

              <p>SVG must have attribute <strong>xmlns</strong> like this: <code>xmlns='http://www.w3.org/2000/svg'</code>. If it doesn't exist, it will be added automagically.</p>

              <p>Encoded SVG can be used in <code>background</code> (<a href="http://codepen.io/collection/DyJRrY/">demos</a>) and <code>border-image</code> (<a href="http://codepen.io/yoksel/full/GjgYgj/">demo</a>).</p>
            </dd>
          </dl>
        </div>

        <div class="containers">
          <div class="container container--left container container--init">
              <h4>Insert your SVG:</h4>
              <button class="button-example">Example</button>
              <textarea
                name="init"
                id="init"
                spellcheck="false"
                ></textarea>
          </div>

          <div class="container container--right container container--result">
            <h4>Take encoded:</h4>
            <textarea
              name="result"
              id="result"
              spellcheck="false"
            ></textarea>
          </div>
        </div>

        <div class="containers">
          <div class="container container--left container container--result-css">
            <h4>Ready for CSS:</h4>
            <textarea
              name="result-css"
              id="result-css"
              spellcheck="false"
            ></textarea>
          </div>

          <div class="container container--right container container--demo">
            <h4>Preview:</h4>

            <div class="contrast-buttons">Background:
              <button
                type="button"
                class="contrast-button contrast-button--white"
                data-color="white"
                title="White">
                <span class="visuallyhidden">White</span>
              </button>
              <button
                type="button"
                class="contrast-button contrast-button--silver"
                data-color="silver"
                title="Silver">
                <span class="visuallyhidden">Silver</span>
              </button>
              <button
                type="button"
                class="contrast-button contrast-button--black"
                data-color="black"
                title="Black">
                <span class="visuallyhidden">Black</span>
              </button>
            </div>

            <div class="demo-wrapper">
              <div id="demo" class="demo"></div>
            </div>
          </div>
        </div>
      </main>

      <footer class="footer">
        <a href="https://github.com/yoksel/url-encoder/">Project on GitHub</a>
        <a href="https://twitter.com/yoksel_en">@yoksel_en</a>
      </footer>
    </div>
  </body>
</html>
              
            
!

CSS

              
                BODY {
  font: 16px/1.4 "Trebuchet MS", Arial, sans-serif;
  color: #000;
}

A {
  color: steelblue;
}

H1 {
  font: 2em/1.4 Georgia, serif;
  text-align: center;
  }

H4 {
  margin: 0;
  margin-bottom: .15em;
  font: 1.3em/1.4 Georgia, serif;
  }

P {
  margin: 1.2rem 0;
  }

TEXTAREA {
  width: 100%;
  height: 150px;
  margin: 0;
  border: 1px solid #CCC;
  border-radius: 10px;
  font-size: 13px;
  font-family: monospace;
  }

CODE {
  padding: 0 3px;
  background: #EEE;
  border-radius: 5px;
  text-shadow: 1px 1px 0 white;
  font: 14px/1.4 monospace;
  color: #333;
  }

CODE I {
  font-style: italic;
  color: black;
  }

DL , DD, DT{
  margin: 0;
  }
  DL {
    text-align: right;
    }
  DT {
    border-bottom: 1px dashed;
    display: inline-block;
    line-height: 1;
    color: steelblue;
    cursor: pointer;
    }
    DT:after {
      content: "";
      display: inline-block;
      border: 0 solid transparent;
      border-width: 8px 4px 0;
      border-top-color: currentColor;
      border-bottom-color: currentColor;
      margin-left: 5px;
      }
      .opened:after {
        border-width: 0 4px 8px ;
        }
  DD {
    text-align: left;
    }

.hidden {
  display: none;
  }

.visuallyhidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  border: 0;
  padding: 0;
  white-space: nowrap;
  clip-path: inset(100%);
  clip: rect(0 0 0 0);
  overflow: hidden;
}

.wrapper {
  width: 650px;
  margin: 1.5rem auto 4rem;
  }

.header {
  position: relative;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #CCC;
}
  .header:before {
    content: "";
    display: table;
    width: 100%;
    clear: both;
  }

.langs {
  position: absolute;
  top: 0;
  right: 0;
  margin: auto;
  list-style-type: none;
}
  .langs__item {
    display: inline-block;
  }
  .langs__link--current {
    color: #000;
  }

.footer {
  position: relative;
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid #CCC;
}

.panel {
  position: relative;
  z-index: 1;
  margin-bottom: 2.5rem;
  display: flex;
  justify-content: space-between;
}

.options {
  position: relative;
}

.options__middle-word {
  vertical-align: middle;
  color: #AAA
}

.options__text {
  display: inline-block;
  border-bottom: 1px dashed;
  color: steelblue;
  cursor: pointer;
}
.options__input:checked + .options__text {
  border: 0;
  color: inherit;
  cursor: default;
}

.expander {
  position: relative;
  z-index: 2;
}

.expanded {
  position: absolute;
  top: -15px;
  right: -15px;
  left: -15px;
  padding: 2rem 1.5rem 1rem;
  background: #FFF;
  border: 1px solid #CCC;
  border-radius: 5px;
  box-shadow: 0 0 0 5px rgba(0,0,0,.1);
}

.button-example {
  padding: 0;
  border: 0;
  border-bottom: 1px dashed;
  line-height: 1;
  align-self: center;
  font: inherit;
  font-size: 14px;
  color: steelblue;
  cursor: pointer;
}

.containers {
  margin-bottom: 32px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  }

.container {
  position: relative;
  width: 48%;
  margin-bottom: 1em;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  }

.demo-wrapper {
  width: 100%;
  border: 1px dashed rgba(0,0,0,.25);
  }
  .demo {
    height: 150px;
    background-repeat: no-repeat;
    }

.contrast-buttons {
  display: flex;
  align-items: center;
  margin-bottom: .4em;
  }
  .contrast-button {
    display: block;
    width: 2em;
    height: 2em;
    margin-left: 5px;
    padding: 0;
    border-radius: 50%;
    border: 1px solid rgba(0,0,0,.25);
    outline: none;
    cursor: pointer;
    }

  .contrast-button--current {
    box-shadow: 0 0 0 3px steelblue;
    }
  .contrast-button:active {
    box-shadow: 0 0 0 3px rgba(0,0,0,.25);
    }

  .contrast-button--white {
    background: white;
    }
  .contrast-button--silver {
    background: silver;
    }
  .contrast-button--black {
    background: black;
    }
              
            
!

JS

              
                var doc = document;

var initTextarea = doc.querySelector( "#init" );
var resultTextarea = doc.querySelector( "#result" );
var resultCssTextarea = doc.querySelector( "#result-css" );
var resultDemo = doc.querySelector( "#demo" );
var demoWrapper = doc.querySelector( ".demo-wrapper" );
var contrastButtons = doc.querySelectorAll( ".contrast-button" );
var contrastButtonCurrent = null;
var backgroundColor = '';

var expanders = doc.querySelectorAll( ".expander" );
var expandedClass = "expanded";
var demoContrastClass = "demo-contrast-on";
var symbols = /[\r\n%#()<>?\[\\\]^`{|}]/g;

const quotesInputs = document.querySelectorAll('.options__input');
let externalQuotesValue = document.querySelector('.options__input:checked').value;
let quotes = getQuotes();

const buttonExample = document.querySelector('.button-example');


// Textarea Actions
//----------------------------------------

initTextarea.onchange = function() {
    resultTextarea.value = encodeSVG(initTextarea.value);
};

initTextarea.onkeyup = function() {
    getResults();
};

function getResults() {
    if(!initTextarea.value) {
        return;
    }

    var namespaced = addNameSpace( initTextarea.value );
    var escaped = encodeSVG( namespaced );
    resultTextarea.value = escaped;
    var resultCss = `background-image: url(${quotes.level1}data:image/svg+xml,${escaped}${quotes.level1});`;
    resultCssTextarea.value = resultCss;
    resultDemo.setAttribute( "style", resultCss );
}


// Tabs Actions
//----------------------------------------

for (var i = 0; i < expanders.length; i++) {
    var expander = expanders[i];

    expander.onclick = function() {
        var parent = this.parentNode;
        var expanded = parent.querySelector( "." + expandedClass );
        expanded.classList.toggle( "hidden" );
        this.classList.toggle( "opened" );
    };
}


// Switch quotes
//----------------------------------------

quotesInputs.forEach(input => {
    input.addEventListener('input', function () {
        externalQuotesValue = this.value;
        quotes = getQuotes();
        getResults();
    });
});


// Set example
//----------------------------------------

buttonExample.addEventListener('click', () => {
    initTextarea.value = `<svg>
  <circle r="50" cx="50" cy="50" fill="tomato"/>
  <circle r="41" cx="47" cy="50" fill="orange"/>
  <circle r="33" cx="48" cy="53" fill="gold"/>
  <circle r="25" cx="49" cy="51" fill="yellowgreen"/>
  <circle r="17" cx="52" cy="50" fill="lightseagreen"/>
  <circle r="9" cx="55" cy="48" fill="teal"/>
</svg>`;
    getResults();
})


// Demo Background Switch
//----------------------------------------

function contrastButtonsSetCurrent(button) {
    const classCurrent = 'contrast-button--current';

    if (contrastButtonCurrent) {
        contrastButtonCurrent.classList.remove(classCurrent);
    }

    backgroundColor = button.dataset.color;
    contrastButtonCurrent = button;
    button.classList.add(classCurrent);
}

contrastButtons.forEach(button => {
    if (!backgroundColor) {
        contrastButtonsSetCurrent(button);
    }

    button.addEventListener('click', function () {
        contrastButtonsSetCurrent(this);
        demoWrapper.style.background = backgroundColor;
    });
});


// Namespace
//----------------------------------------

function addNameSpace( data ) {
    if ( data.indexOf( 'http://www.w3.org/2000/svg' ) < 0 ) {
        data = data.replace( /<svg/g, `<svg xmlns=${quotes.level2}http://www.w3.org/2000/svg${quotes.level2}` );
    }

    return data;
}


// Encoding
//----------------------------------------

function encodeSVG( data ) {
    // Use single quotes instead of double to avoid encoding.
    if ( externalQuotesValue === 'double') {
        data = data.replace( /"/g, '\'' );
    }
    else {
       data = data.replace( /'/g, '"' );
    }

    data = data.replace( />\s{1,}</g, "><" );
    data = data.replace( /\s{2,}/g, " " );

    return data.replace( symbols, encodeURIComponent );
}


// Get quotes for levels
//----------------------------------------

function getQuotes() {
    const double = `"`;
    const single = `'`;

    return {
        level1: externalQuotesValue === 'double' ? double : single,
        level2: externalQuotesValue === 'double' ? single : double
    };
}

// Common
//----------------------------------------

function out( data ) {
    console.log( data );
}
              
            
!
999px

Console