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HTML

              
                <div class="svg-bg">
  <label>
    <span class="svg-bg__label">Your SVG: <small>(Type or upload)</small> <div class="svg-bg__button" is="file-upload" v-on:load="loaded">Upload SVG</div></span>
  <textarea class="svg-bg__input" ref="input" v-model="input">

  </textarea>
  </label>
  
  <span class="svg-bg__label">background-image for CSS: 
  <button class="svg-bg__button" v-on:click="copy">Copy Output</button></span>
  <div class="svg-bg__output" ref="output" v-html="output"></div>
</div>

<!-- SVG Background Pattern Adapted from https://github.com/progers/Patterns-Gallery -->

              
            
!

CSS

              
                

.svg-bg {
  border: solid 4px #000;
  background-color: rgba(255,255,255,.7);
  padding: 2em;
  width: 90%;
  max-width: 800px;
  
  > * { display: block; margin-bottom: 2em; }
  :last-child { margin-bottom: 0; }
}

.svg-bg__label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: bold;
  margin-bottom: 0.5em;
}

.svg-bg__button {
  font-weight: 100;
  border: solid 2px #000;
  background: #000;
  color: #FFF;
  padding: 0.5em 0.75em;
  cursor: pointer;
  text-transform: uppercase;
  font-size: 0.75em;
  letter-spacing: 0.1em;
  
  &:hover {
    background: #FFF;
    color: #000;
  }
}

.svg-bg__input,
.svg-bg__output {
  border: 2px solid #000;
  background-color: rgba(255,255,255,.95);
  font-family: monospace;
  padding: 1%;
  word-break: break-all;
  box-sizing: border-box;
}

.svg-bg__input { 
  display: block;
  width: 100%;
  height: 10em;
  box-sizing: border-box;
}

svg { display: none; }
* { box-sizing: border-box; }
html { width: 100%; height: 100%; }
body { min-height: 100%; display: flex; background-position: center center; }
.svg-bg { margin: auto; }


.file-upload__label {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}
.file-upload__input {
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
  opacity: 0;
  position: absolute;
  top: 0;
  left: 0;
}
              
            
!

JS

              
                console.clear();

Vue.component('file-upload',{

  template: `
<div class="file-upload">
  <label class="file-upload__label">
    <slot></slot>
    <input ref="input" @change="loadFiles" accept=".svg" class="file-upload__input" type="file" />
  </label>
  <div class="file-upload__overlay"></div>
</div>
`,
  
  data: ()=>({
    dragging: false,
  }),
  
  // mounted(){
  //   document.addEventListener("dragenter", function(){ fileDrag.className = 'dragenter'; });
  //   document.addEventListener('dragover',function(e){ e.preventDefault(); /* Essential! */ });
  //   document.addEventListener("drop", FileDragDrop);
  //   fileDrag.addEventListener("dragleave", FileDragReset);
  // },
  
  methods:{
    
    
    loadFiles(e){
        e = e || window.event;
        this.dragLeave(e);
        
        var files = Array.from(e.target.files || e.dataTransfer.files || this.$ref.input.files),
            len = files.length,
            i = 0,
            completed = [];
        
        files.forEach((file) => {
          var reader = new FileReader();
          reader.onloadend = (ev)=>{
            this.$emit('load', reader.result, reader, file);
            //completed.push(reader.result);
            //if ( completed.length >= files.length ) { this.$emit('loaded',completed); }
          };
          reader.readAsText(file);
          //reader.readAsDataURL(file);
        });
    },
    
    dragOver(e){ e.preventDefault(); /* Essential */ },
    dragEnter(){ this.dragging = true },
    dragLeave(e){ this.dragging = false; e.preventDefault(); },


  }
});


new Vue({
  el: '.svg-bg',
  data: ()=>({
    input: `<svg xmlns='http://www.w3.org/2000/svg' width='26' height='26' viewBox="0 0 8 8">
  <circle cx="1" cy="1" r="1" opacity='0.25' />
  <circle cx="5" cy="5" r="1" opacity='0.25' />
</svg>`
  }),

  computed: {
    output(){
      let url = this.encodeSVG(this.optimized);
      document.body.style.backgroundImage = url;
      let msg = 'background-image: ' + url + ';' +
          '<br >/* SVG encoded with https://cdpn.io/rrOZQQ */';
      return msg;
    },
    
    optimized(){
      return this.input
        .replace(/\<\?xml.+\?\>/g, '')
        .replace(/(\<\!DOCTYPE(.*?)\>)/g, '') 
        .replace(/([\s\n]+)/g,' ');
    }
  },

  methods: {
    
    loaded(f){
      console.log('file loaded!', typeof f, f);
      this.input = f;
    },

    copy(){  
      var range = document.createRange();  
      range.selectNode(this.$refs.output);  
      window.getSelection().addRange(range);  

      try {  
        // Now that we've selected the anchor text, execute the copy command  
        var successful = document.execCommand('copy');  
        var msg = successful ? 'successful' : 'unsuccessful';  
        console.log('Copy email command was ' + msg);  
      } catch(err) {  
        console.log('Oops, unable to copy');  
      }  

      // Remove the selections - NOTE: Should use
      // removeRange(range) when it is supported  
      window.getSelection().removeAllRanges();  
    },

    encodeSVG(svg) {
      svg = svg + '';
      var b64 = encodeURIComponent(svg.replace(/\<\?xml.+\?\>|\<\!DOCTYPE.+]\>/g, ''))
        .replace(/%20/g," ")
        .replace(/%3D/g,"=")
      // Additional optimizations thanks to https://codepen.io/tigt/post/optimizing-svgs-in-data-uris
        .replace(/%3A/g, ':') // ditto colons
        .replace(/%2F/g, '/') // ditto slashes
        .replace(/%22/g, "'"); // replace quotes with apostrophes (may break certain SVGs)
      return 'url("data:image/svg+xml;charset=utf-8,'+b64+'")';
    }
  }
});
              
            
!
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