this._values = [ // JS values that Go currently has references to, indexed by reference id
				NaN,
				0,
				null,
				true,
				false,
				globalThis,
				this,
			];
			this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
			this._ids = new Map([ // mapping from JS values to reference ids
				[0, 1],

		"onmousemove" : "handleMouseMove(evt)",
		//"onmouseout" : "handleMouseUp(evt)", // Decomment this to stop the pan functionality when dragging out of the SVG element
	});

	if(navigator.userAgent.toLowerCase().indexOf('webkit') >= 0)
		window.addEventListener('mousewheel', handleMouseWheel, false); // Chrome/Safari
	else
		window.addEventListener('DOMMouseScroll', handleMouseWheel, false); // Others
}

/**

    const td = elem.children[5];
    if (td.nodeName != 'TD') return;
    const name = td.innerText;
    const index = nodes.indexOf(name);
    if (index < 0) return;

    // Disable regexp mode.
    regexpActive = false;

    if (selected.has(index)) {
      unselect(index, elem);
    } else {
      select(index, elem);
    }
    updateButtons();
  }

  function updateButtons() {