// this function is from the work of Taylor Hunt found at https://codepen.io/tigt/post/optimizing-svgs-in-data-uris

function encodeSvg(svgString) {
  return svgString.replace('<svg',(~svgString.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')
  ;}