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HTML

              
                <div id="paper-container"></div>
<a target="_blank" href="https://www.jointjs.com">
  <img id="logo" src="https://assets.codepen.io/7589991/jointjs-logo.svg" width="200" height="50"></img>
</a>
              
            
!

CSS

              
                #paper-container {
  position: absolute;
  right: 0;
  top: 0;
  left: 0;
  bottom: 0;
  overflow: scroll;
}

#logo {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background-color: #ffffff;
  border: 1px solid #d3d3d3;
  padding: 5px;
  box-shadow: 2px 2px 2px 1px rgba(0, 0, 0, 0.3);
}

              
            
!

JS

              
                const { dia, util, shapes: defaultShapes, highlighters, elementTools } = joint;
const shapes = { ...defaultShapes };

// Paper

const paperContainer = document.getElementById("paper-container");

const graph = new dia.Graph({}, { cellNamespace: shapes });
const paper = new dia.Paper({
  model: graph,
  cellViewNamespace: shapes,
  width: "100%",
  height: "100%",
  async: true,
  sorting: dia.Paper.sorting.APPROX,
  background: { color: "#F3F7F6" },
  defaultConnectionPoint: {
    name: "boundary"
  }
});

paperContainer.appendChild(paper.el);

function addImages(image, x = 0, y = 20) {
  const images = [
    image
      .clone()
      .resize(50, 50)
      .position(x + 50, y),
    image
      .clone()
      .resize(100, 100)
      .position(x + 25, y + 90),
    image
      .clone()
      .resize(150, 150)
      .position(x, y + 230)
  ];
  graph.addCells(images);
  return images;
}

// -------------------------------------------------------------------
// 1. Use the image as is with JointJS built-in image shape. The image
// scales with the model, you can control control the aspect ratio with the `preserveAspectRatio` attribute

// The image by Alpár-Etele Méder
const christmasTreeSVG = `<?xml version="1.0" ?>
    <svg id="Christmas_Tree" version="1.1" viewBox="0 0 24 24" xml:space="preserve"
        xmlns="http://www.w3.org/2000/svg"
        xmlns:xlink="http://www.w3.org/1999/xlink">
        <title/>
        <g>
            <polygon points="12,3.5 6.5,9.5 9.5,9.5 5,15 8,15 3.5,20.5 20.5,20.5 16,15 19,15 14.5,9.5 17.5,9.5  " style="fill:#0DB14B;"/>
            <polygon points="12,3.5 6.5,9.5 9.09,9.5  " style="opacity:0.2;fill:#FFFFFF;"/>
            <polygon points="17.5,9.5 12,3.5 14.91,9.5  " style="opacity:0.1;"/>
            <polygon points="8.29,15 10.68,9.5 9.5,9.5 5,15 8,15 3.5,20.5    7.5,20.5 9.88,15  " style="opacity:0.2;fill:#FFFFFF;"/>
            <polygon points="16,15 19,15 14.5,9.5 13.32,9.5 15.71,15 14.12,15 16.5,20.5    20.5,20.5  " style="opacity:0.1;"/>
            <g>
                <circle cx="11.5" cy="8" r="1" style="fill:#FFCF01;"/>
                <circle cx="14" cy="13" r="1" style="fill:#FFCF01;"/>
                <circle cx="10" cy="17" r="1" style="fill:#FFCF01;"/>
                <circle cx="15" cy="18" r="1" style="fill:#FFCF01;"/>
            </g>
            <path d="M10.44,20.5c-0.087,1.145-0.601,2.216-1.44,3h6c-0.839-0.784-1.353-1.855-1.44-3H10.44z   " id="_Path_" style="fill:#9D581F;"/>
            <path d="M10.44,20.5c-0.087,1.145-0.601,2.216-1.44,3h2   c0.312-0.97,0.474-1.981,0.48-3H10.44z" style="opacity:0.2;fill:#FFFFFF;"/>
            <path d="M13.56,20.5h-1c0.006,1.019,0.168,2.03,0.48,3h2   C14.186,22.722,13.657,21.651,13.56,20.5z" style="opacity:0.1;"/>
            <polygon points="12,0.5 12.8,2.13 14.71,2.53 13.3,3.65 13.6,5.44 12,4.59 10.4,5.44 10.7,3.65 9.29,2.53    11.2,2.13  " style="fill:#FFCF01;"/>
            <path d="M20.89,20.18l-3.83-4.68H19c0.276,0.003,0.503-0.218,0.506-0.494   c0.001-0.119-0.04-0.234-0.116-0.326L15.56,10h1.94c0.276,0.002,0.502-0.22,0.503-0.497c0.001-0.127-0.047-0.25-0.133-0.343L14,5   l-0.19-1.12L15,2.92c0.235-0.145,0.308-0.453,0.162-0.688C15.085,2.106,14.956,2.021,14.81,2l-1.67-0.36l-0.69-1.36   c-0.144-0.249-0.462-0.333-0.711-0.189c-0.079,0.046-0.144,0.111-0.189,0.189l-0.69,1.41L9.19,2   C8.917,2.04,8.728,2.294,8.768,2.568C8.79,2.713,8.875,2.842,9,2.92l1.18,0.93L10,5L6.13,9.16C5.942,9.362,5.954,9.679,6.157,9.867   C6.25,9.953,6.373,10.001,6.5,10h1.94l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C4.766,15.46,4.881,15.501,5,15.5h1.94   l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C3.266,20.96,3.381,21.001,3.5,21h6.33c-0.13,0.807-0.528,1.547-1.13,2.1   c-0.221,0.166-0.266,0.479-0.1,0.7C8.694,23.926,8.843,24,9,24h6c0.276,0,0.5-0.224,0.5-0.5c0-0.157-0.074-0.306-0.2-0.4   c-0.602-0.553-1-1.293-1.13-2.1h6.33c0.276,0.003,0.503-0.218,0.506-0.494C21.007,20.387,20.966,20.271,20.89,20.18z M11.3,2.61   c0.149-0.034,0.274-0.133,0.34-0.27L12,1.63l0.35,0.72c0.066,0.137,0.191,0.236,0.34,0.27l0.87,0.19L13,3.26   c-0.144,0.115-0.213,0.299-0.18,0.48l0.13,0.79l-0.71-0.37c-0.144-0.075-0.316-0.075-0.46,0l-0.71,0.37l0.13-0.79   c0.028-0.185-0.049-0.37-0.2-0.48L10.42,2.8L11.3,2.61z M13.89,23h-3.78c0.369-0.616,0.623-1.293,0.75-2h2.26   C13.253,21.708,13.514,22.386,13.89,23z M4.56,20l3.83-4.68c0.177-0.212,0.148-0.527-0.064-0.704C8.234,14.54,8.119,14.499,8,14.5   H6.06l3.83-4.68c0.177-0.212,0.148-0.527-0.064-0.704C9.734,9.04,9.619,8.999,9.5,9H7.64l2.83-3.09c0.053,0.009,0.107,0.009,0.16,0   L12,5.16l1.37,0.72c0.056,0.01,0.114,0.01,0.17,0L16.36,9H14.5c-0.276-0.003-0.503,0.218-0.506,0.494   c-0.001,0.119,0.04,0.234,0.116,0.326l3.83,4.68H16c-0.276-0.003-0.503,0.218-0.506,0.494c-0.001,0.119,0.04,0.234,0.116,0.326   L19.44,20H4.56z" style="fill:#303C42;"/>
            <linearGradient gradientTransform="matrix(1 0 0 -1 0 24)" gradientUnits="userSpaceOnUse" id="SVGID_1_" x1="5.4202" x2="22.4202" y1="14.3604" y2="6.4304">
                <stop offset="0" style="stop-color:#FFFFFF;stop-opacity:0.2"/>
                <stop offset="1" style="stop-color:#FFFFFF;stop-opacity:0"/>
            </linearGradient>
            <path d="M20.89,20.18l-3.83-4.68H19c0.276,0.003,0.503-0.218,0.506-0.494   c0.001-0.119-0.04-0.234-0.116-0.326L15.56,10h1.94c0.276,0.002,0.502-0.22,0.503-0.497c0.001-0.127-0.047-0.25-0.133-0.343L14,5   l-0.19-1.12L15,2.92c0.235-0.145,0.308-0.453,0.162-0.688C15.085,2.106,14.956,2.021,14.81,2l-1.67-0.36l-0.69-1.36   c-0.144-0.249-0.462-0.333-0.711-0.189c-0.079,0.046-0.144,0.111-0.189,0.189l-0.69,1.41L9.19,2   C8.917,2.04,8.728,2.294,8.768,2.568C8.79,2.713,8.875,2.842,9,2.92l1.18,0.93L10,5L6.13,9.16C5.942,9.362,5.954,9.679,6.157,9.867   C6.25,9.953,6.373,10.001,6.5,10h1.94l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C4.766,15.46,4.881,15.501,5,15.5h1.94   l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C3.266,20.96,3.381,21.001,3.5,21h6.33c-0.13,0.807-0.528,1.547-1.13,2.1   c-0.221,0.166-0.266,0.479-0.1,0.7C8.694,23.926,8.843,24,9,24h6c0.276,0,0.5-0.224,0.5-0.5c0-0.157-0.074-0.306-0.2-0.4   c-0.602-0.553-1-1.293-1.13-2.1h6.33c0.276,0.003,0.503-0.218,0.506-0.494C21.007,20.387,20.966,20.271,20.89,20.18z" style="fill:url(#SVGID_1_);"/>
        </g>
    </svg>
`;

const standardImage = new shapes.standard.Image({
  attrs: {
    image: {
      href: `data:image/svg+xml;utf8,${encodeURIComponent(christmasTreeSVG)}`
      // Alternatively convert the SVG to base64
      // href: `data:image/svg+xml;base64;utf8,${btoa(christmasTreeSVG)}`
    },
    label: {
      text: "Christmas Tree",
      fontSize: 10
    }
  }
});

const [, si2, si3] = addImages(standardImage, 20);

// --------------------------------------------------------
// 2. Add placeholders to the original SVG image and replace
// them with the any color dynamically

// The original SVG image with $color placeholder
const templateChristmasTreeSVG = `<?xml version="1.0" ?>
<svg id="Christmas_Tree" version="1.1" viewBox="0 0 24 24" xml:space="preserve"
    xmlns="http://www.w3.org/2000/svg"
    xmlns:xlink="http://www.w3.org/1999/xlink">
    <title/>
    <g>
        <polygon points="12,3.5 6.5,9.5 9.5,9.5 5,15 8,15 3.5,20.5 20.5,20.5 16,15 19,15 14.5,9.5 17.5,9.5  " style="fill:#0DB14B;"/>
        <polygon points="12,3.5 6.5,9.5 9.09,9.5  " style="opacity:0.2;fill:#FFFFFF;"/>
        <polygon points="17.5,9.5 12,3.5 14.91,9.5  " style="opacity:0.1;"/>
        <polygon points="8.29,15 10.68,9.5 9.5,9.5 5,15 8,15 3.5,20.5    7.5,20.5 9.88,15  " style="opacity:0.2;fill:#FFFFFF;"/>
        <polygon points="16,15 19,15 14.5,9.5 13.32,9.5 15.71,15 14.12,15 16.5,20.5    20.5,20.5  " style="opacity:0.1;"/>
        <g>
            <circle cx="11.5" cy="8" r="1" fill="$color"/>
            <circle cx="14" cy="13" r="1" fill="$color"/>
            <circle cx="10" cy="17" r="1" fill="$color"/>
            <circle cx="15" cy="18" r="1" fill="$color"/>
        </g>
        <path d="M10.44,20.5c-0.087,1.145-0.601,2.216-1.44,3h6c-0.839-0.784-1.353-1.855-1.44-3H10.44z   " id="_Path_" style="fill:#9D581F;"/>
        <path d="M10.44,20.5c-0.087,1.145-0.601,2.216-1.44,3h2   c0.312-0.97,0.474-1.981,0.48-3H10.44z" style="opacity:0.2;fill:#FFFFFF;"/>
        <path d="M13.56,20.5h-1c0.006,1.019,0.168,2.03,0.48,3h2   C14.186,22.722,13.657,21.651,13.56,20.5z" style="opacity:0.1;"/>
        <polygon points="12,0.5 12.8,2.13 14.71,2.53 13.3,3.65 13.6,5.44 12,4.59 10.4,5.44 10.7,3.65 9.29,2.53    11.2,2.13  " style="fill:#FFCF01;"/>
        <path d="M20.89,20.18l-3.83-4.68H19c0.276,0.003,0.503-0.218,0.506-0.494   c0.001-0.119-0.04-0.234-0.116-0.326L15.56,10h1.94c0.276,0.002,0.502-0.22,0.503-0.497c0.001-0.127-0.047-0.25-0.133-0.343L14,5   l-0.19-1.12L15,2.92c0.235-0.145,0.308-0.453,0.162-0.688C15.085,2.106,14.956,2.021,14.81,2l-1.67-0.36l-0.69-1.36   c-0.144-0.249-0.462-0.333-0.711-0.189c-0.079,0.046-0.144,0.111-0.189,0.189l-0.69,1.41L9.19,2   C8.917,2.04,8.728,2.294,8.768,2.568C8.79,2.713,8.875,2.842,9,2.92l1.18,0.93L10,5L6.13,9.16C5.942,9.362,5.954,9.679,6.157,9.867   C6.25,9.953,6.373,10.001,6.5,10h1.94l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C4.766,15.46,4.881,15.501,5,15.5h1.94   l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C3.266,20.96,3.381,21.001,3.5,21h6.33c-0.13,0.807-0.528,1.547-1.13,2.1   c-0.221,0.166-0.266,0.479-0.1,0.7C8.694,23.926,8.843,24,9,24h6c0.276,0,0.5-0.224,0.5-0.5c0-0.157-0.074-0.306-0.2-0.4   c-0.602-0.553-1-1.293-1.13-2.1h6.33c0.276,0.003,0.503-0.218,0.506-0.494C21.007,20.387,20.966,20.271,20.89,20.18z M11.3,2.61   c0.149-0.034,0.274-0.133,0.34-0.27L12,1.63l0.35,0.72c0.066,0.137,0.191,0.236,0.34,0.27l0.87,0.19L13,3.26   c-0.144,0.115-0.213,0.299-0.18,0.48l0.13,0.79l-0.71-0.37c-0.144-0.075-0.316-0.075-0.46,0l-0.71,0.37l0.13-0.79   c0.028-0.185-0.049-0.37-0.2-0.48L10.42,2.8L11.3,2.61z M13.89,23h-3.78c0.369-0.616,0.623-1.293,0.75-2h2.26   C13.253,21.708,13.514,22.386,13.89,23z M4.56,20l3.83-4.68c0.177-0.212,0.148-0.527-0.064-0.704C8.234,14.54,8.119,14.499,8,14.5   H6.06l3.83-4.68c0.177-0.212,0.148-0.527-0.064-0.704C9.734,9.04,9.619,8.999,9.5,9H7.64l2.83-3.09c0.053,0.009,0.107,0.009,0.16,0   L12,5.16l1.37,0.72c0.056,0.01,0.114,0.01,0.17,0L16.36,9H14.5c-0.276-0.003-0.503,0.218-0.506,0.494   c-0.001,0.119,0.04,0.234,0.116,0.326l3.83,4.68H16c-0.276-0.003-0.503,0.218-0.506,0.494c-0.001,0.119,0.04,0.234,0.116,0.326   L19.44,20H4.56z" style="fill:#303C42;"/>
        <linearGradient gradientTransform="matrix(1 0 0 -1 0 24)" gradientUnits="userSpaceOnUse" id="SVGID_1_" x1="5.4202" x2="22.4202" y1="14.3604" y2="6.4304">
            <stop offset="0" style="stop-color:#FFFFFF;stop-opacity:0.2"/>
            <stop offset="1" style="stop-color:#FFFFFF;stop-opacity:0"/>
        </linearGradient>
        <path d="M20.89,20.18l-3.83-4.68H19c0.276,0.003,0.503-0.218,0.506-0.494   c0.001-0.119-0.04-0.234-0.116-0.326L15.56,10h1.94c0.276,0.002,0.502-0.22,0.503-0.497c0.001-0.127-0.047-0.25-0.133-0.343L14,5   l-0.19-1.12L15,2.92c0.235-0.145,0.308-0.453,0.162-0.688C15.085,2.106,14.956,2.021,14.81,2l-1.67-0.36l-0.69-1.36   c-0.144-0.249-0.462-0.333-0.711-0.189c-0.079,0.046-0.144,0.111-0.189,0.189l-0.69,1.41L9.19,2   C8.917,2.04,8.728,2.294,8.768,2.568C8.79,2.713,8.875,2.842,9,2.92l1.18,0.93L10,5L6.13,9.16C5.942,9.362,5.954,9.679,6.157,9.867   C6.25,9.953,6.373,10.001,6.5,10h1.94l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C4.766,15.46,4.881,15.501,5,15.5h1.94   l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C3.266,20.96,3.381,21.001,3.5,21h6.33c-0.13,0.807-0.528,1.547-1.13,2.1   c-0.221,0.166-0.266,0.479-0.1,0.7C8.694,23.926,8.843,24,9,24h6c0.276,0,0.5-0.224,0.5-0.5c0-0.157-0.074-0.306-0.2-0.4   c-0.602-0.553-1-1.293-1.13-2.1h6.33c0.276,0.003,0.503-0.218,0.506-0.494C21.007,20.387,20.966,20.271,20.89,20.18z" style="fill:url(#SVGID_1_);"/>
    </g>
</svg>
`;

class TemplateImage extends dia.Element {
  defaults() {
    return {
      ...super.defaults,
      type: "TemplateImage",
      attrs: {
        image: {
          width: "calc(w)",
          height: "calc(h)"
          // href: '[URL]'
        },
        label: {
          textVerticalAnchor: "top",
          textAnchor: "middle",
          x: "calc(w/2)",
          y: "calc(h + 10)",
          fontSize: 10,
          fill: "#333333"
        }
      }
    };
  }

  preinitialize() {
    this.dataURLPrefix = "data:image/svg+xml;utf8,";
    this.markup = [
      {
        tagName: "image",
        selector: "image"
      },
      {
        tagName: "text",
        selector: "label"
      }
    ];
  }

  initialize(...args) {
    super.initialize(...args);
    this.on("change:color", this.setImageColor);
    this.setImageColor();
  }

  setImageColor() {
    const svg = this.get("svg") || "";
    const color = this.get("color") || "black";
    this.attr(
      "image/href",
      this.dataURLPrefix + encodeURIComponent(svg.replace(/\$color/g, color))
    );
  }
}
shapes.TemplateImage = TemplateImage;

const templateImage = new TemplateImage({
  svg: templateChristmasTreeSVG,
  attrs: {
    label: {
      text: "Template Christmas Tree",
      fontSize: 10
    }
  }
});

const [ti1, ti2, ti3] = addImages(templateImage, 220);
ti1.set("color", "red");
ti2.set("color", "purple");
ti3.set("color", "orange");

// ----------------------------------------------
// 3. The original image is inserted directly into the markup and extended with selectors (and group-selectors)
// The size of the image SVG element is set to `calc(w)` and `calc(h)` so that it can be scaled with the element.
// The SVG image changes can be made via the `attr` method using the selectors.

// The string converted into JSON markup with the `util.svg` function.
const markupChristmasTree = util.svg`
    <svg @selector="image" version="1.1" viewBox="0 0 24 24" xml:space="preserve"
        xmlns="http://www.w3.org/2000/svg"
        xmlns:xlink="http://www.w3.org/1999/xlink">
        <g>
            <polygon points="12,3.5 6.5,9.5 9.5,9.5 5,15 8,15 3.5,20.5 20.5,20.5 16,15 19,15 14.5,9.5 17.5,9.5  " style="fill:#0DB14B;"/>
            <polygon points="12,3.5 6.5,9.5 9.09,9.5  " style="opacity:0.2;fill:#FFFFFF;"/>
            <polygon points="17.5,9.5 12,3.5 14.91,9.5  " style="opacity:0.1;"/>
            <polygon points="8.29,15 10.68,9.5 9.5,9.5 5,15 8,15 3.5,20.5    7.5,20.5 9.88,15  " style="opacity:0.2;fill:#FFFFFF;"/>
            <polygon points="16,15 19,15 14.5,9.5 13.32,9.5 15.71,15 14.12,15 16.5,20.5    20.5,20.5  " style="opacity:0.1;"/>
            <g>
                <circle @group-selector="balls" cx="11.5" cy="8" r="1"/>
                <circle @group-selector="balls" cx="14" cy="13" r="1"/>
                <circle @group-selector="balls" cx="10" cy="17" r="1"/>
                <circle @group-selector="balls" cx="15" cy="18" r="1"/>
            </g>
            <path d="M10.44,20.5c-0.087,1.145-0.601,2.216-1.44,3h6c-0.839-0.784-1.353-1.855-1.44-3H10.44z   " id="_Path_" style="fill:#9D581F;"/>
            <path d="M10.44,20.5c-0.087,1.145-0.601,2.216-1.44,3h2   c0.312-0.97,0.474-1.981,0.48-3H10.44z" style="opacity:0.2;fill:#FFFFFF;"/>
            <path d="M13.56,20.5h-1c0.006,1.019,0.168,2.03,0.48,3h2   C14.186,22.722,13.657,21.651,13.56,20.5z" style="opacity:0.1;"/>
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                <stop offset="1" style="stop-color:#FFFFFF;stop-opacity:0"/>
            </linearGradient>
            <path d="M20.89,20.18l-3.83-4.68H19c0.276,0.003,0.503-0.218,0.506-0.494 c0.001-0.119-0.04-0.234-0.116-0.326L15.56,10h1.94c0.276,0.002,0.502-0.22,0.503-0.497c0.001-0.127-0.047-0.25-0.133-0.343L14,5   l-0.19-1.12L15,2.92c0.235-0.145,0.308-0.453,0.162-0.688C15.085,2.106,14.956,2.021,14.81,2l-1.67-0.36l-0.69-1.36   c-0.144-0.249-0.462-0.333-0.711-0.189c-0.079,0.046-0.144,0.111-0.189,0.189l-0.69,1.41L9.19,2   C8.917,2.04,8.728,2.294,8.768,2.568C8.79,2.713,8.875,2.842,9,2.92l1.18,0.93L10,5L6.13,9.16C5.942,9.362,5.954,9.679,6.157,9.867   C6.25,9.953,6.373,10.001,6.5,10h1.94l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C4.766,15.46,4.881,15.501,5,15.5h1.94   l-3.83,4.68c-0.177,0.212-0.148,0.527,0.064,0.704C3.266,20.96,3.381,21.001,3.5,21h6.33c-0.13,0.807-0.528,1.547-1.13,2.1   c-0.221,0.166-0.266,0.479-0.1,0.7C8.694,23.926,8.843,24,9,24h6c0.276,0,0.5-0.224,0.5-0.5c0-0.157-0.074-0.306-0.2-0.4   c-0.602-0.553-1-1.293-1.13-2.1h6.33c0.276,0.003,0.503-0.218,0.506-0.494C21.007,20.387,20.966,20.271,20.89,20.18z" style="fill:url(#SVGID_1_);"/>
        </g>
    </svg>
    <text @selector="label"></text>
`;

class MarkupImage extends dia.Element {
  defaults() {
    return {
      ...super.defaults,
      type: "MarkupImage",
      attrs: {
        root: {
          magnetSelector: "outline"
        },
        image: {
          width: "calc(w)",
          height: "calc(h)"
        },
        label: {
          fontSize: 10,
          textVerticalAnchor: "top",
          textAnchor: "middle",
          x: "calc(0.5*w)",
          y: "calc(h + 10)"
        }
      }
    };
  }

  preinitialize() {
    this.markup = markupChristmasTree;
  }
}
shapes.MarkupImage = MarkupImage;

const markupImage = new MarkupImage({
  attrs: {
    label: {
      text: "Markup Christmas Tree"
    }
  }
});

const [mi1, mi2, mi3] = addImages(markupImage, 420);
mi1.attr("balls/fill", "darkred");
mi2.attr("balls/fill", "lightsalmon");
mi3.attr("balls/fill", "white");

// -----------------------------
// Highlighters

// Use highlighter with the image element (notice a slight difference in the highlight for markup style).
highlighters.stroke.add(si2.findView(paper), "image", "h");
highlighters.stroke.add(ti2.findView(paper), "image", "h");
highlighters.stroke.add(mi2.findView(paper), "image", "h");

// Use highlighter with an image sub-element (3).
highlighters.stroke.add(mi3.findView(paper), "outline", "h", {
  useFirstSubpath: true
});

// -----------------------------
// Links
// JointJS can connect a link exactly to a sub-element (3).

const link1 = new shapes.standard.Link({
  source: { id: si3.id },
  target: { id: ti3.id }
});

const link2 = new shapes.standard.Link({
  source: { id: ti3.id },
  target: { id: mi3.id }
});

graph.addCells([link1, link2]);

// ----------------------------------------------
// Events
// The sub-element is not clickable. Everything inside the image is a black-box (1,2)

paper.on("element:mouseenter", (elementView) => {
  elementView.addTools(
    new dia.ToolsView({
      tools: [
        new elementTools.Boundary({
          padding: 1,
          useModelGeometry: true,
          attributes: {
            fill: "#4a7bcb",
            "fill-opacity": 0.1,
            stroke: "#4a7bcb",
            "stroke-width": 2,
            "stroke-dasharray": "none",
            "pointer-events": "none",
            rx: 2,
            ry: 2
          }
        })
      ],
      layer: dia.Paper.Layers.BACK
    })
  );
});

paper.on("element:mouseleave", (elementView) => {
  elementView.removeTools();
});

// ----------------------------------------------
// DOM
// A high number of DOM elements can negatively affect the performance (3).

              
            
!
999px

Console