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HTML

              
                <article>
    <header>
        <h1>Encode SVG for SPFx</h1>
        <p>A fork of <a href="https://codepen.io/jakob-e/pen/doMoML">Jakob-e's Encode SVG SCSS</a>, which in turn is a small function in response to <a href="https://codepen.io/Tigt/" target="_blank">Taylor Hunt's</a> blog post <a href=" https://codepen.io/Tigt/blog/optimizing-svgs-in-data-uris" target="_blank">"Optimizing svgs in data uris"</a> allowing you to skip base64 encoding and simply paste the SVG markup right in the CSS.</p>       
    </header>
    <section>
        <label for="pastezone">Paste SVG below, then copy again:</label>
        <textarea id="pastzone" placeholder="Paste SVG Code here!"></textarea>
    </section>

    <section>
        <h2>Use examples</h2>
        <p>In your web part's manifest file, replace the <strong>"officeFabricIconFontName"</strong> line with the following:
        <div data-ace-mode="json">"iconImageUrl": "[the encoded SVG from above]"
</div>
    </section>
</article>
<!-- ;charset=utf8 -->
              
            
!

CSS

              
                // –––––––––––––––––––––––––––––––––––––––––––––––––––––––––
//  Google Fonts  v.2.0.0
// –––––––––––––––––––––––––––––––––––––––––––––––––––––––––
//
//  Subset config 
//    
//  Note! 
//  The Latin subset is always included if available and need not be specified. 
//  Please note that if a client browser supports unicode-range the subset parameter 
//  is ignored; the browser will select from the subsets supported by the font to 
//  get what it needs to render the text.
//  Source: https://developers.google.com/fonts/docs/getting_started
//
$google-font-subsets: (
  'arabic'      : false 
  , 'bengali'     : false 
  , 'cyrillic'    : false 
  , 'cyrillic-ext': false 
  , 'devanagari'  : false 
  , 'greek'       : false 
  , 'greek-ext'   : false 
  , 'gujarati'    : false
  , 'hebrew'      : false 
  , 'khmer'       : false 
  , 'latin'       : false
  , 'latin-ext'   : false 
  , 'tamil'       : false 
  , 'telugu'      : false 
  , 'thai'        : false
  , 'vietnamese'  : false 
) !default;

//  
//   Google Fonts
//
@mixin google-font(
  $name   : null,     //  string (unquoted will work too)
  $weights: 400,      //  list or numeric value (100 200 300 400 ...)
  $styles : normal,   //  list or string (normal and or italic)
  $text   : null      //  string (don\'t forget to unescape )
  ){
    //  base url
    $URL: '//fonts.googleapis.com/css?family=';

    //  create global variables 
    @if not variable-exists(__gf__combine){ $__gf__combine: false !global; }
    @if not variable-exists(__gf__map){ $__gf__map: () !global; }   
    @if not variable-exists(google-font-subsets){ $google-font-subsets: () !global; }   

    //  append italic to weights
    @if index($styles, italic) and not str-index($weights+'',i){
      $wgt: if(index($styles, normal), $weights, ()); 
      @each $weight in $weights { $wgt: append($wgt, $weight + i); }
      $weights: $wgt;
    } 

    //  reduce and encode text
    @if $text {
      $list: __gf__list-unique(__gf__str-explode($text));
      $text:'&text=';
      $encode:('!':'%21','#':'%23','$':'%24','&':'%26','\'':'%27',
               '(':'%28',')':'%29','*':'%2A','+':'%2B',',':'%2C',
               '/':'%2F',':':'%3A',';':'%3B','=':'%3D','?':'%3F',
               '@':'%40','[':'%5B',']':'%5D',' ':'%20');           
      @for $i from 1 through length($list) {
        $char: map-get($encode,nth($list,$i)) or nth($list,$i);
        $text: $text + $char;
      }
    }

    //  subsets from config
    $subset: '';    
    @each $set, $enabled in $google-font-subsets {
      @if $enabled {
        $subset: $subset + if($subset == '', '', ',') + $set;            
      }
    } 
    $subset: if(str-length($subset) > 0 and $subset != latin, '&subset=' + $subset, '');

    @if $name {
      //  replace name whitespaces  
      $name: if(type-of($name) == string, unquote($name),$name);
      $name: __gf__str-replace(inspect($name),' ','+');
      @if $__gf__combine and not $text {
        //  add weights to combine map 
        $wgt: map-get($__gf__map, $name) or ();
        $wgt: __gf__list-unique(join($wgt, $weights, comma));
        $__gf__map: map-merge($__gf__map, ($name: $wgt)) !global;
      } @else {
        //  create query
        $query: '';
        @each $weight in $weights { $query: $query + if($query != '', ',', '') + $weight; }
        $query: __gf__str-replace($query, ' ');
        $query: $name + if(str-length($query) > 0 and $query != '400',  ':'+ $query, '');

        //  create single immport
        @at-root { @import url($URL + $query + if($text, $text, '') + $subset); }
      }
    } @else {
      //  set combine flag
      $__gf__combine: true  !global;

      //  nested includes   
      @content;

      //  convert combine map to query
      //  (remove weights if just 400)
      $query:'';        
      @each $font, $weights in $__gf__map {
        $query: $query + if($query != '', '|', '') + $font + 
                if(length($weights) == 1 and (nth($weights, 1) == '400'), 
                '', ':' + join((), $weights, comma));
      }       

      //  remove query whitespaces 
      $query: __gf__str-replace($query,' ');

      //  create combined immport
      @at-root { @import url($URL + $query + $subset); }

      //  reset combine flag
      $__gf__combine: false !global;
    }
}
// 
//  Helper functions
//
@function __gf__list-unique($list) {
  $result: ();
  @each $item in $list { @if not index($result, $item+''){ $result: append($result, $item+'');} }
  @each $item in $result { $result: set-nth($result, index($result, $item),unquote($item)); }
  @return $result;
}
@function __gf__str-replace($string, $search, $replace: '') {
  $index: str-index($string, $search); 
  @return if($index, 
    str-slice($string, 1, $index - 1) + $replace + 
    __gf__str-replace(str-slice($string, $index + 
    str-length($search)), $search, $replace), 
    $string);
}
@function __gf__str-explode($string){
  $list:(); 
  @for $i from 1 through str-length($string) { $list: append($list, str-slice($string, $i, $i)); } 
  @return $list;
}



html { box-sizing: box-model; }
*, *:before, *:after { box-sizing: inherit; outline:0; }
header,main,nav,article,section,figure,figcaption,code{ display:block;position: relative; }


@mixin aspect-ratio($arglist... /*$width/$ratio, $height*/){
    $map : keywords($arglist);
    $height: map-get($map, height) or nth-or-null($arglist, 2);
    $width:  map-get($map, width)  or nth-or-null($arglist, 1);
    $ratio:  map-get($map, ratio)  or if($width and $height, $width/$height, nth-or-null($arglist, 1)) or 1;
    $padding: 1/$ratio * 100%;
    &:before { content: ''; float:left; padding-bottom: $padding; }
    &:after  { content: ''; display:table; clear: both; }
}
// Helper function 
// Return null rather than throwing an error if index is outside list range.    
@function nth-or-null($list, $index) {
  @return if(length($list) >= $index, nth($list, $index), null);
}    







//
//  Function to create an optimized svg url
//
@function svg-url($svg){
    //
    //  Add missing namespace
    //
    @if not str-index($svg,xmlns) {
        $svg: str-replace($svg, '<svg','<svg xmlns="http://www.w3.org/2000/svg"');   
    }        
    //    
    //  Chunk up string in order to avoid 
    //  "stack level too deep" error
    //     
    $encoded:'';
    $slice: 2000;
    $index: 0;
    $loops: ceil(str-length($svg)/$slice);
    @for $i from 1 through $loops {
        $chunk: str-slice($svg, $index, $index + $slice - 1); 
        //
        //   Encode 
        //
        $chunk: str-replace($chunk,'"', '\'');
        $chunk: str-replace($chunk,'%', '%25');
        $chunk: str-replace($chunk,'&', '%26');
        $chunk: str-replace($chunk,'#', '%23');       
        $chunk: str-replace($chunk,'{', '%7B');
        $chunk: str-replace($chunk,'}', '%7D');         
        $chunk: str-replace($chunk,'<', '%3C');
        $chunk: str-replace($chunk,'>', '%3E');
        
        // 
        //    The maybe list 
        //
        //    Keep size and compile time down
        //    ... only add on documented fail 
        // 
        //  $chunk: str-replace($chunk, '|', '%7C');
        //  $chunk: str-replace($chunk, '[', '%5B');
        //  $chunk: str-replace($chunk, ']', '%5D');
        //  $chunk: str-replace($chunk, '^', '%5E');
        //  $chunk: str-replace($chunk, '`', '%60');
        //  $chunk: str-replace($chunk, ';', '%3B');
        //  $chunk: str-replace($chunk, '?', '%3F');
        //  $chunk: str-replace($chunk, ':', '%3A');
        //  $chunk: str-replace($chunk, '@', '%40');
        //  $chunk: str-replace($chunk, '=', '%3D');      
        
        $encoded: #{$encoded}#{$chunk};
        $index: $index + $slice; 
    }
    @return url("data:image/svg+xml,#{$encoded}");   
}
        
//  Background svg mixin          
@mixin background-svg($svg){
    background-image: svg-url($svg);        
}        
            
//  Helper function to replace characters in a string
@function str-replace($string, $search, $replace: '') {
    $index: str-index($string, $search); 
    @return if($index, 
        str-slice($string, 1, $index - 1) + $replace + 
        str-replace(str-slice($string, $index + 
        str-length($search)), $search, $replace), 
        $string); 
}              
            
        
            
        






// 
// Same as above but without loops
// 
// DO NOT USE THIS YET 
// – When used on large svg's it will break in Ruby Sass  
//   due to the mentioned "SystemStackError: stack level too deep"
// 
// @function old_svg-url($svg){
//    //  Add missing namespace
//    @if not str-index($svg,xmlns) {
//        $svg: str-replace($svg, '<svg','<svg xmlns="http://www.w3.org/2000/svg"');   
//    }     
//    $svg: str-replace($svg,'"','\'');
//    $svg: str-replace($svg,'<','%3C');
//    $svg: str-replace($svg,'>','%3E');
//    $svg: str-replace($svg,'&','%26');
//    $svg: str-replace($svg,'#','%23');
//    @return url("data:image/svg+xml,#{$svg}");   
// }

$svg-cartman:'<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 300"><path fill="#804D35" d="M35 254.6l9.7 28.8 211 1.7 12-34L35 255"/><path fill="#2F2B33" d="M40 288c1.3 1.2 221 0 221 0s5.3-6.4-50.2-10c-34.4.8-55.7 6-55.7 6s-25-6-47-6c-91 4-69 8.8-68 10z"/><path fill="#EE304E" d="M15.2 187.8s20.3-30 36.2-35.4c3.6 1.2 189 1.5 198.3 1.2 26.8 5.8 23.5 24 31.6 26.4 1.8-.3 11 79.6-19.8 77.6-1.3 2.5-50.6 4-55.7 4.5s-21.4 10-43 13c-4.6 1-78.7 0-78.7 0s-34-4-55-26c-1-2 0-9-13-60z"/><ellipse cx="151.3" cy="128.9" fill="#FFEDC3" rx="109.8" ry="76.8"/><path fill="#00B8C3" d="M43 114.6c0-49 58-81 107-82 82.7-2 106.5 68.2 105.3 67.6C133.3 44.7 43 114.6 43 114.6z"/><path fill="#FCEE21" d="M44.3 117.7c43.7-26 94-35.7 144.5-30.4 16 1.7 32 5 47.6 9.8 4.5 2 9 3 13.4 5l3.5 2c-1 0 .3 0 .6 1 4 2 8-4.2 3-6.2-22-10-46-14.6-69-17-51-6.5-103 4.5-148 31-4 2.3-1 9 4 6.3zm72.4-84.4s9-4.8 10.4-3.8 2-2.3 2-2.3l9-2h11l1-2.3s12-1 13 2c0 4 15.7 4 15 10-2.5 8-12 2-13 4-11.4 6-17 0-17 0l-13 4-1-7s-3 5-8 5.3c-17.3 4-9-8.5-9-8.5zm-100.5 155C6 189.3-7 221 24 227.3c10.4-2.6 40 2 36-13s-33.8-24.2-44-26zm267.4-7s5-1 8 4 4.7 22.2 4 27.6-.6 10-13.8 11-18.8-9-19.8-8-14.2 1-14.2 1-7.4-7 1.3-12c4-3 4-8 4-8s5-12 9-14 22-2 22-2z"/><path fill="none" stroke="#000" stroke-miterlimit="10" d="M68 167.3c11 12 91 71 170.3-5.6m-73 45.6c2 36.4-1.3 65.6-1.3 65.6"/><ellipse cx="157.1" cy="213.4" rx="1" ry="3"/><ellipse cx="159.7" cy="238.7" rx="1.2" ry="3.3"/><ellipse cx="157.2" cy="262.7" rx="2" ry="3.4"/><path fill="none" stroke="#000" stroke-miterlimit="10" d="M139 188.5c15.7 5.5 38 0 38 0"/><ellipse cx="182.5" cy="119.1" fill="#FFF" transform="matrix(.81 -.587 .587 .81 -35.153 129.678)" rx="26.7" ry="30.5"/><ellipse cx="126.5" cy="119.1" fill="#FFF" transform="matrix(.884 .467 -.467 .884 70.21 -45.287)" rx="26.7" ry="30.5"/><circle cx="138.6" cy="117.9" r="3.3"/><circle cx="170.6" cy="117.9" r="3.3"/><path d="M134.7 172.4c3.4-3.5 7.7-3.2 7.7-3.2s24.2-.2 25.5.3 2 3 2 4.2c-1 1.4-5 10.7-7 13.3-2 1.8-9 0-9 0s-4-1-5-1.8c-.7-.3-3.4 0-4-.2s-11.5-10.6-12-12.3"/><path fill="#FFF" d="M149 172.3c-.2-1-1-1.7-1.8-1.5l-3 .5c-.8 0-1.3 1-1.2 2 .2 1 1 1.7 1.8 1.5l3-.5c1 0 1.4-1 1.2-2zm9 1.5c.2-.8-.3-1.6-1-1.8l-4.2-.8c-.7 0-1.5.4-1.6 1.2v.3c-.3.8.2 1.6 1 1.8l4 .8c.8 0 1.6-.4 1.7-1.2zm9-.4c0-1-.8-1.7-1.6-1.6l-5 .4c-.8 0-1.4 1-1.3 1.8 1 1 1 1.7 2 1.6l5-.4c1 0 2-1 2-1.8z"/></svg>';

.cartman {
    @include aspect-ratio();
    width: 40%;
    margin: 40px 0;
    padding: 0;
    position: relative;
    @include background-svg($svg-cartman); // <= here :-)
    background-size: cover; 
    background-repeat:no-repeat;
    background-position:50% 50%;
}

figcaption {
    position:absolute;
    display:block;
    left: 100%;
    &:before,&:after {    
        content:'';
        position:absolute;
        display:block;
    }
    &:before {
        font:15px 'Comic Sans MS';
        content:'SVG in CSS freaking sucks ...Wait What!';
        text-transform:uppercase;
        width:230px;
        text-align:center;
        border:1px solid #f1f1f1;
        background:white;
        border-radius:5px;
        padding:20px;
    }
    &:after{
        top:75px;
        left: 10px;
        transform:rotate(30deg);
        border-top:30px solid white;
        border-left:10px solid transparent;    
        border-right:10px solid transparent;        
    }
}



$logo-color : #00b8c4;
$body-color : whitesmoke;
$h1-color   : #00b8c4;
$h2-color   : #00b8c4;
$h3-color   : #00b8c4;
$text-color : #282828;
$link-color : #00b8c4;


html { box-sizing: box-model; }
*, *:before, *:after { box-sizing: inherit; }
header,main,nav,article,section,figure,figcaption,code{ display:block;position: relative; }


@include google-font {
    @include google-font(Lato, 300 400 700);
    @include google-font(Lato, 300 400 700, italic);  
    @include google-font('Playfair Display', $text: '“”‘’"\'');
    @include google-font('Lateef');
}




p,label { font: 400 16px/1.3 'Lato', sans-serif; color: $text-color; }
h1      { font: 300 36px/1.3 'Lato', sans-serif; color: $h1-color; }
h2      { font: 300 24px/1.3 'Lato', sans-serif; color: $h2-color; }
[class*="example"] {font: 400 14px/1.3 'Lato', sans-serif; color: white; }
a {color: $link-color; text-decoration: none; &:hover,&:focus {
    text-decoration: underline;
}}

strong { font: inherit; font-weight: 700; }
em     { font: inherit; font-style: italic; }
p     { max-width: 700px; }
blockquote { 
    padding:0; margin:20px 0;
    &:before { content: '“'; font-family: 'Playfair Display'; font-size:16px; }
    &:after  { content: '”'; font-family: 'Playfair Display'; font-size:16px; }    
}
[data-related-pens] { background: $logo-color; }


body { 
  background: $body-color;
}
article {
    margin:-20px auto 40px; 
    max-width: 900px;
    border-radius: 7px;
    padding: 20px 40px 0;
    // background: white;
    // box-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
}
section { margin: 40px 0; }




textarea {
    outline: 0;
    margin-top: 8px; 
    width:100%;
    height:200px;
    background:whitesmoke;
    border:1px solid #dddd;
}
input { margin-top: 8px; outline: 0; background:whitesmoke; font-size:20px; padding:10px;  border:1px solid #dddd; display:block;
width:calc(100% - 20px); }
[for="pastezone"],
[for="peninclude"]{font-weight: 700; }




// Removed: charset=utf8 

              
            
!

JS

              
                //
// Editor: //cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js
var theme='ace/theme/tomorrow';
var mode='ace/mode/scss';
var editors = document.querySelectorAll('[data-ace-mode]');
console.log( editors.length );
for(var i=0,l=editors.length;i<l;++i){
    var editor= ace.edit(editors[i]);
    if(editors[i].getAttribute('data-ace-theme')){
        editor.setTheme('ace/theme/'+editors[i].getAttribute('data-ace-theme'));
    } else {
        editor.setTheme(theme);
    }
    if(editors[i].getAttribute('data-ace-mode')){
        editor.getSession().setMode('ace/mode/'+editors[i].getAttribute('data-ace-mode'));
    } else {
        editor.getSession().setMode(mode);
    }
    editor.renderer.setShowGutter(false); 
    editor.setShowPrintMargin(false);
    editor.setShowPrintMargin(false);
    editor.setDisplayIndentGuides(false);
    editor.setOptions({ 
        maxLines: Infinity, 
        //readOnly: false,
        highlightActiveLine: false,
        highlightGutterLine: false      
    });
}



function getTextAreaSelection(textarea) {
    var start = textarea.selectionStart, end = textarea.selectionEnd;
    return {
        start: start,
        end: end,
        length: end - start,
        text: textarea.value.slice(start, end)
    };
}

function detectPaste(textarea, callback) {
    textarea.onpaste = function() {
        var sel = getTextAreaSelection(textarea);
        var initialLength = textarea.value.length;
        window.setTimeout(function() {
            var val = textarea.value;
            var pastedTextLength = val.length - (initialLength - sel.length);
            var end = sel.start + pastedTextLength;
            callback({
                start: sel.start,
                end: end,
                length: pastedTextLength,
                text: val.slice(sel.start, end)
            });
        }, 1);
    };
}

var textarea = document.getElementById("pastzone");
detectPaste(textarea, function(svg) {

    
        txt = svg.text
        .replace('<svg',(~svg.text.indexOf('xmlns')?'<svg':'<svg xmlns="http://www.w3.org/2000/svg"'))
        
        //
        //   Encode (may need a few extra replacements)
        //
        .replace(/"/g, '\'')
        .replace(/%/g, '%25')
        .replace(/#/g, '%23')       
        .replace(/{/g, '%7B')
        .replace(/}/g, '%7D')         
        .replace(/</g, '%3C')
        .replace(/>/g, '%3E')

        .replace(/\s+/g,' ') 
        // 
        //    The maybe list (add on documented fail)
        // 
        //  .replace(/&/g, '%26')
        //  .replace('|', '%7C')
        //  .replace('[', '%5B')
        //  .replace(']', '%5D')
        //  .replace('^', '%5E')
        //  .replace('`', '%60')
        //  .replace(';', '%3B')
        //  .replace('?', '%3F')
        //  .replace(':', '%3A')
        //  .replace('@', '%40')
        //  .replace('=', '%3D')          

    textarea.value = 'data:image/svg+xml,'+txt;
    textarea.select();
});
              
            
!
999px

Console