JSFiddle - React, Tailwind, and code Playground

HTML

<svg id="thesvg" width="100%" height="100%"></svg>

CSS

.foreign {
    text-align: left;
    //magically made the div fit the text
}
.insideforeign {
    display: inline-block;
}
svg {
    border:1px solid black;
}

JavaScript

var mousedownonelement = false;

window.getlocalmousecoord = function (svg, evt) {
    var pt = svg.createSVGPoint();
    pt.x = evt.clientX;
    pt.y = evt.clientY;
    var localpoint = pt.matrixTransform(svg.getScreenCTM().inverse());
    localpoint.x = Math.round(localpoint.x);
    localpoint.y = Math.round(localpoint.y);
    return localpoint;
};

window.createtext = function (localpoint, svg) {
    var myforeign = document.createElementNS('http://www.w3.org/2000/svg', 'foreignObject')
    var textdiv = document.createElement("div");
    var textnode = document.createTextNode("Click to edit");
    textdiv.appendChild(textnode);
    textdiv.setAttribute("contentEditable", "true");
    textdiv.setAttribute("width", "auto");
    myforeign.setAttribute("width", "100%");
    myforeign.setAttribute("height", "100%");
    myforeign.classList.add("foreign"); //to make div fit text
    textdiv.classList.add("insideforeign"); //to make div fit text
    textdiv.addEventListener("mousedown", elementMousedown, false);
    myforeign.setAttributeNS(null, "transform", "translate(" + localpoint.x + " " + localpoint.y + ")");
    svg.appendChild(myforeign);
    myforeign.appendChild(textdiv);

};

function elementMousedown(evt) {
    mousedownonelement = true;
}


$(('#thesvg')).click(function (evt) {
    var svg = document.getElementById('thesvg');
    var localpoint = getlocalmousecoord(svg, evt);
    if (!mousedownonelement) {
        createtext(localpoint, svg);
    } else {
        mousedownonelement = false;
    }
});