Embed external SVG image into the DOM so attributes (fill, background) can be manipulated via JavaScript

embed-svg.js

fetch( 'image.svg' )
    .then( response => response.text() )
    .then( content => {
        const doc = new DOMParser().parseFromString( content, 'text/xml' ),
              svg = doc.querySelector('svg');

        svg.setAttribute( 'fill', '#d20a11' );
        document.getElementById('image-container').append( svg );
    });