SVG Tooltip

const tooltip = document.getElementById("map-tooltip");

document.querySelectorAll(".county").forEach(path => {

  path.addEventListener("mousemove", e => {

    tooltip.textContent = path.dataset.tooltip;

    tooltip.style.left = e.pageX + "px";

    tooltip.style.top = e.pageY + "px";

    tooltip.style.opacity = 1;

  });

  path.addEventListener("mouseleave", () => {

    tooltip.style.opacity = 0;

  });

});